To provide an intake passage member capable of being die-cut without destroying cores even having curved portions in intake passages and of being die-cast or injection molded with a synthetic resin.

The intake passage member 100 for the internal combustion engine comprises a throttle body 110 (an intake passage body) with intake passages 111, 121 having the curved portions 117 and an insulator 120 laid between the intake passage body and the internal combustion engine. The intake passage 121 for the insulator extends to the direction of distributing intake air, part of the curved portion 117 of the intake passage is formed in the intake passage 121 for the insulator, and the intake passages for both the intake passage body and the insulator are formed to allow the die cutting of the cores 131, 132, 141, 142. The intake passage member which is capable of being die-cut without destroying the cores can be manufactured with die casting or injection molding with a synthetic resin.