To provide an installation assisting kit for a Pachinko machine, fixing an outer frame of the Pachinko machine to a frame of a bank of game machines using a level or the like without changing an once set angle of inclination by a worker alone, whereby the Pachinko machine body can be installed at a predetermined angle of inclining backward to stabilize an expected prize winning rate.

This installation assisting kit is used for installing the Pachinko machine at a predetermined angle of inclining backward to facilities of the bank of game machines. The kit includes a substantially rectangular auxiliary frame body 1 abuttign on the substantially whole surface of the front of the outer frame of the Pachinko machine and at least one connecting member 4 for temporarily stopping an auxiliary frame body 3 to the outer frame 1 with the outer frame 1 and the auxiliary frame body 3 abutting on each other.