---
title: "クォータニオン"
content_type: tutorial
url: "https://learn.unity.com/tutorial/quaternions-jp?language=ja"
language: ja
difficulty: intermediate
duration_minutes: 5
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last_updated: "2026-08-04T14:22:35.000Z"
---

# クォータニオン

クォータニオンを使って Unity でゲームオブジェクトの回転を正確に制御する方法を学びます。

クォータニオンシステムを利用してゲームオブジェクトの回転を管理する方法を学びます。

## 1. クォータニオン

[Video](http://www.youtube.com/watch?v=hd1QzLf4ZH8)

**MotionScript クラスのコード**

```csharp
using UnityEngine;
using System.Collections;

public class MotionScript : MonoBehaviour 
{    
    public float speed = 3f;


    void Update () 
    {
        transform.Translate(-Input.GetAxis("Horizontal") * speed * Time.deltaTime, 0, 0);
    }
}
```

**LookAtScript クラスのコード**

```csharp
using UnityEngine;
using System.Collections;

public class LookAtScript : MonoBehaviour 
{
    public Transform target;


    void Update () 
    {
        Vector3 relativePos = target.position - transform.position;
        transform.rotation = Quaternion.LookRotation(relativePos);
    }
}
```

**GravityScript クラスのコード**

```csharp
using UnityEngine;
using System.Collections;

public class GravityScript : MonoBehaviour 
{
    public Transform target;


    void Update () 
    {
        Vector3 relativePos = (target.position + new Vector3(0, 1.5f, 0)) - transform.position;
        Quaternion rotation = Quaternion.LookRotation(relativePos);

        Quaternion current = transform.localRotation;

        transform.localRotation = Quaternion.Slerp(current, rotation, Time.deltaTime);
        transform.Translate(0, 0, 3 * Time.deltaTime);
    }
}
```

**SomeClass クラスのコード**

```csharp
using UnityEngine;
using System.Collections;

public class SomeClass : MonoBehaviour 
{
    void Start () 
    {
        transform.rotation = Quaternion.identity;
    }
}
```