INTERNAL COMBUSTION ENGINE

In an internal combustion engine, a piston (8) reciprocating in a cylinder (19) and a crankshaft (1) are linked with each other by a piston-crank linking mechanism (4, 5, 10). The crankshaft (1) includes a counterweight (15). When the piston (8) is located in the proximity of a bottom dead center, an outermost portion of the counterweight (15) crosses an imaginary extension line extended from a piston pin (7) in an axial direction of the piston pin (7).