Input.GetAxisRaw

説明

axisName で識別される仮想軸の平滑化フィルターが適用されていない値を返します

The value will be in the range -1...1 for keyboard and joystick input. Since input is not smoothed, keyboard input will always be either -1, 0 or 1. This is useful if you want to do all smoothing of keyboard input processing yourself.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Update() {
        float speed = Input.GetAxisRaw("Horizontal") * Time.deltaTime;
        transform.Rotate(0, speed, 0);
    }
}