To provide a work barge capable of preventing breakage of an actuator of a pin roller jack device by receiving force generated by vertical motion of a water surface, elsewhere other than at the actuator.

A fixing device 401 is placed so that a pressing force is applied from a direction orthogonal to a tilt surface of a spud 301 of a pin roller jack device. When the pin roller jack device is not in use, a spud support frame 202 or the spud 301 is pressed by the fixing device 401, and thereby transmission of external force to an actuator 205 is prevented.