An energy treatment instrument includes: an end effector provided at a distal end of a support portion a handle main body supporting the support portion a movable handle attached to be movable with respect to the handle main body for operating the end effector and a switch provided on a side surface of the handle main body, and capable of changing an ON/OFF status of an energy output from the end effector when operated in a direction substantially along a longitudinal axis of the support portion.
