To provide a hinge assembling system constructed to improve the mass-productivity of hinge devices while reducing physical labor for workers.

A hinge supporting shaft 241 is pressed into a first bearing member 231 held by a bearing holding member 322 by a press executing mechanism 330, thus eliminating the need for a worker to press the hinge supporting shaft 241 therein. The hinge supporting shaft 241 is kept in the state of being pressed into the first bearing member 231 by a press keeping tool 310, thus eliminating a worker to assemble the first bearing member 231 on a second bearing member in the state of pressing the hinge supporting shaft 241 with his fingers. When the first bearing member 231 is assembled on the second bearing member, there is no case that the end face of the hinge supporting shaft 241 scratches the second bearing member.

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