A medical treatment apparatus includes a first holding member, and a second holding member configured to move relative to the first holding member and hold a living tissue between the first holding member and the second holding member. On a cross section including a point where the first and second holding member are in contact with the living tissue, a point on the first holding member that is nearest to the second holding member is defined as a first point and a point on the second holding member that is nearest to the first holding member is defined as a second point. The first and second holding member have shapes in which an extended line of a trace of the second point moving relative to the first holding member does not pass through the first point.
