Connecting rod, the internal combustion engine, a manufacturing method of a motor vehicle and a connecting rod

A is to be suitably improved seizure resistance of the small end of a connecting rod made of a titanium alloy. A connecting rod (1) is formed from a titanium alloy, the rod body portion (10), the small end portion provided at one end of the rod body portion (20), provided at the other end of the rod body portion comprising a large end section (30). Connecting rod further includes an inner peripheral surface (20i) which is formed on the chromium nitride layer of at least the small end portion (50). .The