To provide a Stirling engine in which a displacer piston and a power piston can be coaxially moved smoothly in a simple structure.

One end of a first connecting rod 62 is rotatably supported on a first crank (crankshaft 82) having a first rotational center (C2) at a first offset position with respect to the rotary shaft 81 of a flywheel 80, and the other end thereof is swingably supported on the radial center (RC) of the power piston 40. One end of the slider rod 50 is fixed to the displacer piston 20 and the other end thereof is slidably supported by the power piston. One end of a second connecting rod 72 is rotatably supported by a second crank (link plate 71) having a second rotational center (C7) at a second offset position with respect to the rotary shaft 81, and the other end thereof is swingably supported with the slider rod.