diff --git a/SMILEBASIC/VM.d b/SMILEBASIC/VM.d
index aae32e7..b07b355 100644
--- a/SMILEBASIC/VM.d
+++ b/SMILEBASIC/VM.d
@@ -551,3 +551,68 @@ class NewArray : Code
         }
     }
 }
+class PopGArray : Code
+{
+    int var;
+    int dim;
+    this(int var, int dim)
+    {
+        this.var = var;
+        this.dim = dim;
+    }
+    override void execute(VM vm)
+    {
+        Value array = vm.global[var];
+        if(!array.isArray)
+        {
+            throw new TypeMismatch();
+        }
+        int[4] index;
+        for(int i = dim - 1; i >= 0; i--)
+        {
+            Value v;
+            vm.pop(v);
+            if(v.type == ValueType.Integer)
+            {
+                index[i] = v.integerValue;
+                continue;
+            }
+            if(v.type == ValueType.Double)
+            {
+                index[i] = cast(int)v.doubleValue;
+                continue;
+            }
+            throw new TypeMismatch();
+        }
+        Value assign;
+        vm.pop(assign);
+        if(array.type == ValueType.IntegerArray && assign.isNumber)
+        {
+            array.integerArray[index[0..dim]] = assign.castInteger();
+            return;
+        }
+        if(array.type == ValueType.DoubleArray && assign.isNumber)
+        {
+            array.doubleArray[index[0..dim]] = assign.castDouble();
+            return;
+        }
+        if(array.type == ValueType.StringArray && assign.type == ValueType.String)
+        {
+            array.stringArray[index[0..dim]] = assign.stringValue;
+            return;
+        }
+        if(array.type == ValueType.String && assign.type == ValueType.String)
+        {
+            if(dim != 1)
+            {
+                //TODO:syntaxError
+                throw new TypeMismatch();
+            }
+            //TODO:文字列の挙動
+            throw new TypeMismatch();
+            //array.stringValue[index[0]] = assign.stringValue[0];
+            return;
+        }
+        throw new TypeMismatch();
+    }
+}
diff --git a/SMILEBASIC/compiler.d b/SMILEBASIC/compiler.d
index 10bd1cc..74d3677 100644
--- a/SMILEBASIC/compiler.d
+++ b/SMILEBASIC/compiler.d
@@ -162,6 +162,18 @@ class Compiler
                     }
                 }
                 break;
+            case NodeType.IndexExpressions://[expr,expr,expr,expr]用
+                {
+                    auto index = cast(IndexExpressions)exp;
+                    int count = 0;
+                    foreach_reverse(Expression i; index.expressions)
+                    {
+                        compileExpression(i);
+                        count++;
+                        if(count >= 4) break;//念のため
+                    }
+                }
+                break;
             default:
                 stderr.writeln("Compile:NotImpl ", exp.type);
                 break;
@@ -358,6 +370,13 @@ class Compiler
             case NodeType.Var:
                 compileVar(cast(Var)i, s);
                 break;
+            case NodeType.ArrayAssign:
+                {
+                    auto assign = cast(ArrayAssign)i;
+                    compileExpression(assign.assignExpression);
+                    compileExpression(assign.indexExpression);
+                    genCode(new PopGArray(getGlobalVarIndex(assign.name), assign.indexExpression.expressions.length));
+                }
             default:
                 stderr.writeln("Compile:NotImpl ", i.type);
         }
diff --git a/SMILEBASIC/main.d b/SMILEBASIC/main.d
index c15f0d3..01066e1 100644
--- a/SMILEBASIC/main.d
+++ b/SMILEBASIC/main.d
@@ -54,6 +54,7 @@ FOR I=0 TO 10
  ?I
 NEXT
 VAR V[10]
+V[0]=12
 ?V[0]
 ?\"ABC\"[1][0]
 GOSUB @A
diff --git a/SMILEBASIC/parser.d b/SMILEBASIC/parser.d
index 1aeb981..6a8d7d9 100644
--- a/SMILEBASIC/parser.d
+++ b/SMILEBASIC/parser.d
@@ -554,13 +554,19 @@ class Parser
     IndexExpressions indexExpressions()
     {
         IndexExpressions ie = new IndexExpressions();
+        int count = 0;
         while(true)
         {
             ie.addExpression(expression());
+            count++;
             auto token = lex.front();
             if(token.type == TokenType.Comma)
             {
                 lex.popFront();
+                if(count >= 4)
+                {
+                    syntaxError();
+                }
                 continue;
             }
             if(token.type == TokenType.RBracket)
@@ -589,7 +595,9 @@ class Parser
             syntaxError();
             return null;
         }
+        lex.popFront();
         auto expr = expression();
+        token = lex.front();
         auto node = new ArrayAssign(name, ie, expr);
         return node;
     }
diff --git a/SMILEBASIC/type.d b/SMILEBASIC/type.d
index d79e82b..491552d 100644
--- a/SMILEBASIC/type.d
+++ b/SMILEBASIC/type.d
@@ -17,6 +17,7 @@ struct Value
     {
         int integerValue;
         double doubleValue;
+        //TODO:Array!wchar stringValue;にしたい
         wstring stringValue;
         Array!int integerArray;
         Array!double doubleArray;
@@ -71,6 +72,23 @@ struct Value
                 return false;
         }
     }
+    bool isArray()
+    {
+        return this.type == ValueType.IntegerArray || this.type == ValueType.DoubleArray ||
+            this.type == ValueType.StringArray || this.type == ValueType.String;
+    }
+    bool isNumber()
+    {
+        return this.type == ValueType.Integer || this.type == ValueType.Double;
+    }
+    int castInteger()
+    {
+        return this.type == ValueType.Integer ? this.integerValue : (this.type == ValueType.Double ? cast(int)this.doubleValue : 0);
+    }
+    double castDouble()
+    {
+        return this.type == ValueType.Integer ? this.integerValue : (this.type == ValueType.Double ? this.doubleValue : 0);
+    }
 }
 class Array(T)
 {
@@ -98,6 +116,40 @@ class Array(T)
         array = new T[len];
         dimCount = dim.length;
     }
+    T opIndexAssign(T v, int[] dim)
+    {
+        import core.exception;
+        switch(dim.length)
+        {
+            case 1:
+                 return this[dim[0]] = v;
+            case 2:
+                return this[dim[0], dim[1]] = v;
+            case 3:
+                return this[dim[0], dim[1], dim[2]] = v;
+            case 4:
+                return this[dim[0], dim[1], dim[2], dim[3]] = v;
+            default:
+                throw new RangeError();
+        }
+    }
+    T opIndex(int[] dim)
+    {
+        import core.exception;
+        switch(dim.length)
+        {
+            case 1:
+                return this[dim[0]];
+            case 2:
+                return this[dim[0], dim[1]];
+            case 3:
+                return this[dim[0], dim[1], dim[2]];
+            case 4:
+                return this[dim[0], dim[1], dim[2], dim[3]];
+            default:
+                throw new RangeError();
+        }
+    }
     T opIndex(int i1)
     {
         return array[i1];
@@ -114,5 +166,21 @@ class Array(T)
     {
         return array[i1];//array[i1 * dim[0] * dim[1] * dim[2] + i2 * dim[1] + i3];
     }
+    T opIndexAssign(T v, int i1)
+    {
+        return array[i1] = v;
+    }
+    T opIndexAssign(T v, int i1, int i2)
+    {
+        return array[i1 * dim[0] + i2] = v;
+    }
+    T opIndexAssign(T v, int i1, int i2, int i3)
+    {
+        return array[i1 * dim[0] * dim[1] + i2 * dim[1] + i3] = v;
+    }
+    T opIndexAssign(T v, int i1, int i2, int i3, int i4)
+    {
+        return array[i1] = v;//array[i1 * dim[0] * dim[1] * dim[2] + i2 * dim[1] + i3] = v;
+    }
 
 }