An ablation therapeutic device includes a therapeutic electrode (63) which is disposed at a distal end portion of a resectoscope (1) and has a first loop-shaped portion (63a) at a distal end thereof, and a compression section (64) which has a second loop-shaped portion (64b) extending to a position in front of the therapeutic electrode (63), has a higher rigidity than the therapeutic electrode (63), and performs an ablation therapeutic treatment of a living body tissue by a push-out operation. The therapeutic electrode (63) has a bend portion (63b) which is bent in an obliquely forward direction from.a perpendicular plane (P1) to a direction of an axis of the resectoscope (1), and the compression section (64) has a length in a direction of the perpendicular plane (P2), which is less than a length of the bend portion (63b) of the therapeutic electrode (63) in the direction of the perpendicular plane (P2).
