diff --git a/frontend/component/game_table.ts b/frontend/component/game_table.ts
index 08e360e..06580e1 100644
--- a/frontend/component/game_table.ts
+++ b/frontend/component/game_table.ts
@@ -40,7 +40,7 @@ export class GameTable {
 
   handleWheelEvent(deltaY: number) {
     if (Math.abs(deltaY) < 1) return
-    this.nowSize += (Math.abs(deltaY) / deltaY) * Math.log(Math.abs(deltaY))
+    this.nowSize -= (Math.abs(deltaY) / deltaY) * Math.log(Math.abs(deltaY))
     this.nowSize = Math.min(Math.max(this.nowSize, 16), 100)
     this.updateTableStyle()
   }
diff --git a/frontend/lib/game.ts b/frontend/lib/game.ts
index cf56566..88287ed 100644
--- a/frontend/lib/game.ts
+++ b/frontend/lib/game.ts
@@ -234,8 +234,8 @@ export class GeneralsGame {
   }
 
   handleKeydown(ev: JQuery.KeyDownEvent) {
-    if (ev.code === 'Digit9') return this.game_table.handleWheelEvent(-20)
-    if (ev.code === 'Digit0') return this.game_table.handleWheelEvent(20)
+    if (ev.code === 'Digit9') return this.game_table.handleWheelEvent(20)
+    if (ev.code === 'Digit0') return this.game_table.handleWheelEvent(-20)
     if (ev.code === 'Digit1') return this.game_table.updateSize(35)
     if (ev.code === 'Digit2') return this.game_table.updateSize(38)
     if (ev.code === 'Digit3') return this.game_table.updateSize(42)