A sensor detects presence and temperature of a measurement object. The sensor includes: a temperature sensor that detects the temperature of the measurement object; a sensor holder that holds the temperature sensor in a movable manner; and a detector that detects the presence of the measurement object in response to a movement of the temperature sensor. The detector includes a shield that moves in response to the movement of the temperature sensor, the sensor holder includes a pipe that holds the shield and controls a movement of the shield such that the shield moves in a predetermined direction in response to the movement of the temperature sensor, and the shield and the pipe are different in hardness.