A bread maker having upper and lower rollers, a baking tray, a housing forming an oven chamber, a door attached to the front of the housing, a baking tray detachably mounted in the oven chamber, and a sensor. The sensor senses whether the baking tray is mounted in the oven chamber. The sensor is mounted in at least one of the housing and the door and moves back and forth a predetermined distance depending on contact with the baking tray. A sensing switch which senses the movement of the sensor.