It is an object of the present invention to provide a contact press-fitting apparatus which can perform the press-fitting of all of the contacts with high reliability, without leading to problems such as buckling of the contacts, even in cases where the array pitch of the contacts is uneven. The contact press-fitting apparatus comprises a supporting member which is inserted into the press-fitting head from a direction perpendicular to the press-fitting direction of the press-fitting head, and which supports the side surfaces of the contacts on the sides that the abutting part does not abut against.