An outer frame of a razor head includes two side parts, a front part and a rear part connecting the side parts. An inner side wall of each side part provides a positioning block which has a first plane for mounting and supporting razor blade assemblies. Resilient arms are connected with side walls of the positioning blocks. Each resilient arm includes a leg part connecting the positioning block and a head part connecting an end of the leg part. An inclination angle between the leg part and the first plane is in the range of 25°˜30°. The head part is extended out of the first plane. The resilient arm can provide a suitable supporting force to a razor blade holder within its allowable range to be prevented from being fractured easily, and in turn improve the using performance of the outer frame and extend its lifetime.