A medical equipment comprising: a surgical instrument having a movable part to perform medical treatment on a target spot of medical treatment; an actuator configured to operate the movable part; a detachable interface (20, 21, 25) installed on the surgical instrument and configured to attachably and detachably couple the surgical instrument to the actuator; and a regulating member, wherein the detachable interface (20, 21, 25) includes an origin return mechanism configured to move the movable part to a predetermined origin position when the surgical instrument is detached from the actuator, the origin return mechanism includes: a moving member connected to the movable part to be contactable with the actuator, having an initial position when spaced apart from the actuator, and moved from the initial position by contact with the actuator; and a return member (29, 30, 30a, 30b, 31) configured to move the moving member to the initial position, the return member (29, 30, 30a, 30b, 31) includes a biasing member configured to bias the moving member and to cause the moving member to be moved to the initial position, the regulating member is configured to regulate movement of the moving member by the biasing member, characterized in that the regulating member includes an adjustment part configured to adjust an amount of movement of the moving member. a surgical instrument having a movable part to perform medical treatment on a target spot of medical treatment; an actuator configured to operate the movable part; a detachable interface (20, 21, 25) installed on the surgical instrument and configured to attachably and detachably couple the surgical instrument to the actuator; and a regulating member, wherein the detachable interface (20, 21, 25) includes an origin return mechanism configured to move the movable part to a predetermined origin position when the surgical instrument is detached from the actuator, the origin return mechanism includes: a moving member connected to the movable part to be contactable with the actuator, having an initial position when spaced apart from the actuator, and moved from the initial position by contact with the actuator; and a return member (29, 30, 30a, 30b, 31) configured to move the moving member to the initial position, the return member (29, 30, 30a, 30b, 31) includes a biasing member configured to bias the moving member and to cause the moving member to be moved to the initial position, the regulating member is configured to regulate movement of the moving member by the biasing member, characterized in that the regulating member includes an adjustment part configured to adjust an amount of movement of the moving member. a moving member connected to the movable part to be contactable with the actuator, having an initial position when spaced apart from the actuator, and moved from the initial position by contact with the actuator; and a return member (29, 30, 30a, 30b, 31) configured to move the moving member to the initial position, the return member (29, 30, 30a, 30b, 31) includes a biasing member configured to bias the moving member and to cause the moving member to be moved to the initial position, the regulating member is configured to regulate movement of the moving member by the biasing member, characterized in that the regulating member includes an adjustment part configured to adjust an amount of movement of the moving member.