To provide a variable cam timing phase shifter capable of reducing weight of the whole phase shifter while ensuring strength as a driving element.

This variable cam timing phase shifter for an internal combustion engine having at least one cam shaft 120 is provided with a housing 104 having the outer periphery for receiving driving force and constituted by a first material (for example, aluminum), a rotor 102 connected with the cam shaft 120 arranged coaxially in the housing 104, and the driving element 108 arranged coaxially at the outer periphery of the housing 104 and constituted by a second material (for example, steel).