Steam engine

The invention provides a steam engine. Even if the steam engine is inclined, water stored in a tank can be prevented from leaking out of a replacement hole. A steam engine (1) according to the present invention is provided with: a tank assembly (21) for storing a liquid; a vaporizing chamber (16) that receives the supply of the liquid from the tank assembly (21) and generates vapor from the liquid; and a hollow space part (81). The box assembly (21) and the space part (81) are communicated through a communication hole (85); the space section (81) is provided with a replacement hole (86) that connects the inside and outside of the space section (81). 一种蒸汽机，即使将蒸汽机倾斜也能够抑制贮存在箱中的水从置换孔漏出。本发明的蒸汽机(1)具备：箱组装体(21)，贮存液体；气化室(16)，从箱组装体(21)接受液体的供给，从液体生成蒸汽；以及中空的空间部(81)；箱组装体(21)和空间部(81)通过连通孔(85)连通；在空间部(81)中设有将空间部(81)的内外连通的置换孔(86)。