PROBLEM TO BE SOLVED: To provide a heating device that is easy to clean and has high energy efficiency.SOLUTION: A heating device (100) uses steam (45) to heat objects to be heated (90), and comprises a transfer device (10) that transfers the objects to be heated (90), a dome part (20) that covers the upper side of the transfer device (10), a liquid holding container (30) that is located below the dome part (20) and holds liquid (35) introduced to a region (36) below the transfer device (10), and steam introducing parts (40) that introduce the steam (45) to space (50) surrounded by the dome part (20) and the liquid holding container (30).【課題】清掃が容易で、エネルギー効率の良い加熱装置を提供する。【解決手段】蒸気(45)を用いて被加熱物(90)を加熱する加熱装置(100)であり、被加熱物(90)を移送する移送装置(10)と、移送装置(10)の上方を覆うドーム部(20)と、ドーム部(20)の下方に位置し、移送装置(10)の下の領域(36)に導入される液体(35)を保持する液体保持容器(30)と、ドーム部(20)と液体保持容器(30)とによって囲まれた空間(50)に、蒸気(45)を導入する蒸気導入部(40)とを備えた、加熱装置(100)である。【選択図】図1