A valve timing controller includes a first rotor having a first gear, a second rotor having a second gear, and a planet gear engaged with the first and the second gear. The first rotor has the support opening and accommodates the second rotor therein. The second rotor has the supporting spindle part which supports the support opening from its inner circumference. The support opening and the supporting spindle part are formed in a minor diameter rather than the second gear which engages the planet gear with lubricant. The supporting opening and the supporting spindle part are positioned at a place which deviates from the second gear in an axial direction thereof.