The medical treatment device 1 is provided on at least one of a pair of holding members and a pair of holding members for holding a target site to be joined in a living tissue, and the target site is held by a pair of holding members. The first and second energy applying units 82 and 92 that contact the target site and apply energy to the target site, and the first and second energy applying units 82 and 92 to the target site. An energy control unit 361 for applying high-frequency energy in the first period, applying ultrasonic energy in the second period after the first period, and applying thermal energy in the third period after the second period； Is provided.医療用処置装置１は、生体組織における接合の対象部位を挟持する一対の保持部材と、一対の保持部材のうち少なくともいずれか一方の保持部材に設けられ、一対の保持部材にて対象部位が挟持された際に当該対象部位に接触し、当該対象部位に対してエネルギを付与する第１，第２エネルギ付与部８２，９２と、第１，第２エネルギ付与部８２，９２から対象部位に対して、第１期間で高周波エネルギを付与させ、第１期間の後の第２期間で超音波エネルギを付与させ、第２期間の後の第３期間で熱エネルギを付与させるエネルギ制御部３６１と、を備える。
