Patent ID: 7895984

Claim:
An intake device of an internal combustion engine, comprising: an upper passage wall and a lower passage wall which are disposed next to each other in a vertical direction and are connected together to form an intake passage, wherein the lower passage wall has a recessed portion, which is recessed in a horizontal direction, in part of an inner surface thereof, in a deep portion in the horizontal direction, the recessed portion has a recessed surface to which a negative pressure outlet port for taking out negative pressure generated in the intake passage opens, an opening which opens upwards is provided in a position which opposes to the upper passage wall in the vertical direction at an upper portion of the recessed portion, the upper passage wall has a projecting portion which extends further downwards than a mating surface between the upper passage wall and the lower passage wall and which projects into the recessed portion through the opening, the projecting portion is positioned above the negative pressure outlet port and between the negative pressure outlet port and the inner surface in the horizontal direction, and a lower end portion of the projecting portion is formed into an arc shape in which a central portion in a direction which is perpendicular to the horizontal direction as viewed from a vertical direction projects downwards.