PROBLEM TO BE SOLVED: To provide a medical device which is easy to disinfect and sterilize, is hygienic, and can suppress an excessive rise in surface temperature. SOLUTION: A medical device (10) has a Peltier element (100) having a first surface (1001) and a second surface (1002), and the first surface is an endothermic surface with respect to the Peltier element. In addition, a control means (830) for executing the first energization control in which the second surface serves as a heat dissipation surface, and a latent heat storage agent (16) arranged on the second surface while maintaining a thermal contact state. And a housing (11F, 11R) for accommodating the Peltier element and the latent heat storage agent in a state where the heat conductive member covering the first surface or at least a part of the first surface is exposed. [Selection diagram] Fig. 2【課題】例えば、消毒滅菌作業が容易であり、衛生的であり、表面温度の過剰な上昇を抑制し得る医療機器を提供する。【解決手段】医療機器（１０）は、第１の面（１００１）と第２の面（１００２）とを有するペルチェ素子（１００）と、前記ペルチェ素子に対し、前記第１の面が吸熱面、且つ、前記第２の面が放熱面となる第１の通電制御を実行する制御手段（８３０）と、前記第２の面に熱的接触状態を保って配置された潜熱蓄熱剤（１６）と、前記第１の面又は前記第１の面の少なくとも一部を覆う熱伝導性部材が露出した状態で前記ペルチェ素子及び前記潜熱蓄熱剤を収納する筐体（１１Ｆ、１１Ｒ）とを備える。【選択図】図２
