To provide a brake structure of a loading and unloading vehicle which changes brake torque in accordance with a running speed of a vehicle body, a weight of a cargo of a loading and unloading device, or a difference among individual drivers.

A pair of brake pads 19 which nip a brake disc 18 from both side faces are respectively fixed non-nip faces on a pair of nip bodies 21 on both side faces of the brake disc which are supported rotatably in the direction in which the brake disc is nipped and held by a nip shaft 20, the brake disc 18 is nipped and held by a spring 23 nipped between a non-fixed face of the brake pad of the nip body 21 and a drive part 25B of an actuator fixed on a vehicle body, and the drive part 25B of the actuator drives to expand and shrink a spring 23 by a pushbutton arranged in a cab.