TROLLY

A trolley is disclosed. The trolley according to an embodiment of the present invention comprises a body unit, which supports a wheel rolling in contact with a rail and has a hooking unit to hang an object; a screw axis, which is installed to be rotatable below the body unit; a compressing unit, which includes a friction pad arranged below the rail and a compressing member connected to the friction pad by an elastic member arranged below the friction pad, and which lifts up and down the compressing member by the operation of the screw axis in order to compress the bottom of the rail by the friction pad or to release the compression; one and more protruding units, which are arranged in the friction pad and protrude through the penetrating hole of the compressing member when the friction pad is in contact with the bottom of the rail by the compression of the compression member; and a marking unit, which is fixed to the lower part of the compressing member to be rotated and marks the status of compressing the bottom of the rail after being pushed by the protruding unit during compression.