PROBLEM TO BE SOLVED: To provide a technology concerning a pump device supplying liquid to a medical water jet scalpel.SOLUTION: A pump device supplying liquid to a medical water jet scalpel discharging liquid includes: a pump unit exclusively performing a suction operation of sucking liquid from the outside, and a liquid feeding operation of sending the sucked liquid to the water jet scalpel and a control part controlling the suction operation and the liquid feeding operation, and performing the suction operation, based on an operation of stopping discharge of the water jet scalpel by a user.
