A treatment section of a surgical device, configured to apply energy to a biological tissue as a treatment target, and treat the biological tissue as the treatment target, includes: first and second jaws which are relatively openable/closable to each other to enable holding and releasing the biological tissue including the treatment target and its surrounding tissue； a pair of mutually opposed first holding sections which are provided respectively on inner sides of outer edges of the first and second jaws, and configured to hold the biological tissue as the treatment target； an energy discharge section which is provided on at least one of the pair of first holding sections, and configured to give energy for a treatment to the biological tissue as the treatment target； and a pair of second holding sections which are provided respectively between the first holding sections and the outer edges of the first and second jaws, and configured to hold the surrounding tissue of the biological tissue as the treatment target while bending the surrounding tissue with respect to the biological tissue as the treatment target.
