An engine comprising: an intake passage connected to a combustion chamber; and a throttle valve in the intake passage, wherein the intake passage includes: a first passage section provided with the throttle valve and extending from one side of the engine to the other side of the engine along a cylinder bank; and a second passage section provided with a specified second valve and connected to a part of the first passage section located toward the other side with respect to the throttle valve, the second passage section extends from a connecting point between the first and second passage sections (30, 40) toward the one side and then turns back and extends from the one side toward the other side, the second valve is located in a part of the second passage section extending toward the other side and overlapping, in the direction of the cylinder bank, with a part of the second passage section extending from the connecting point to the one side, and the second passage section branches off from downstream of the throttle valve in the first passage section, characterized in that the second valve is configured as an EGR valve for adjusting a backflow rate of external EGR gas. an intake passage connected to a combustion chamber; and a throttle valve in the intake passage, wherein the intake passage includes: a first passage section provided with the throttle valve and extending from one side of the engine to the other side of the engine along a cylinder bank; and a second passage section provided with a specified second valve and connected to a part of the first passage section located toward the other side with respect to the throttle valve, the second passage section extends from a connecting point between the first and second passage sections (30, 40) toward the one side and then turns back and extends from the one side toward the other side, the second valve is located in a part of the second passage section extending toward the other side and overlapping, in the direction of the cylinder bank, with a part of the second passage section extending from the connecting point to the one side, and the second passage section branches off from downstream of the throttle valve in the first passage section, characterized in that the second valve is configured as an EGR valve for adjusting a backflow rate of external EGR gas. a first passage section provided with the throttle valve and extending from one side of the engine to the other side of the engine along a cylinder bank; and a second passage section provided with a specified second valve and connected to a part of the first passage section located toward the other side with respect to the throttle valve, the second passage section extends from a connecting point between the first and second passage sections (30, 40) toward the one side and then turns back and extends from the one side toward the other side, the second valve is located in a part of the second passage section extending toward the other side and overlapping, in the direction of the cylinder bank, with a part of the second passage section extending from the connecting point to the one side, and the second passage section branches off from downstream of the throttle valve in the first passage section, characterized in that the second valve is configured as an EGR valve for adjusting a backflow rate of external EGR gas.