To provide the door opening and closing sensor of a refrigerator which can raise the productivity by simplifying the constitution and the setup work.

This sensor is equipped with a door switch housing 100 which is made in the shape of a curved cover and covers the mounting hole 2a of an inner case 2 and in which the terminal part of a lead wire coupled with the control circuit of a refrigerator is made on one side, and a door opening/ closing sensing switch 200 which is inserted in the mounting hole 2a of the inner case 2 and in which a switch terminal to engage with the terminal 130 of the door switch housing 100 is made on one side.