SEAT BELT ATTACHMENT/DETACHMENT DETECTION SWITCH

A seat belt attachment/detachment detection switch (1) comprises:a printed circuit board (11) including a circuit for detecting attachment/detachment of a seat belt;a movable plate (2) configured to slidably move along with insertion of a tongue plate of the seat belt;a rotor (12) including a lever (121) coupled to the movable plate (2), the rotor (12) being rotatably attached to the printed circuit board (11) to rotate as the tongue plate is pushed into a buckle;and an electric brush (14) attached to the surface of the rotor (12) that faces the printed circuit board (11), the electric brush (14) having leg parts (141, 142) that change a state of contact/non-contact with a conductive part (111, 112) of the circuit in accordance with a rotating state of the rotor (12).