An internal combustion engine for increasing the freedom of the layout of a rocker arm wherein the rocker arm is lighter. The internal combustion engine includes a camshaft having a first exhaust cam and a second exhaust cam, a first exhaust valve, and a second exhaust valve. The internal combustion engine further includes a first rocker arm for actuating the first exhaust valve to open and close, a second rocker arm for actuating the second exhaust valve to open and close, and a decompression mechanism for lifting the first rocker arm in a valve opening direction at the timing of a compression stroke initiated by the internal combustion engine. The first rocker arm and the second rocker arm are provided with an angular movement transmitter for transmitting a turning force produced by a decompression operator in the valve opening direction from the first rocker arm to the second rocker arm.