An air intake device for an engine, the air intake device comprising: an intake passage for leading intake air to combustion chambers of a multi-cylinder engine; an exhaust passage for discharging exhaust gas from the combustion chambers; and an EGR passage connecting the intake passage with the exhaust passage for returning a portion of the exhaust gas as EGR gas from the exhaust passage to the intake passage, wherein the EGR passage includes, in a position close to a connection port to the intake passage, an expanding portion in which a passage cross-sectional area expands and which lowers a flow speed of the EGR gas so as to reduce an uneven flow, in the connection port, of the EGR gas flowing into the intake passage, wherein the EGR passage includes a passage portion extending toward the connection port and in a direction intersecting with the intake passage and intersecting with a center line of the connection port and a direction-changing portion being continuous with the passage portion, changing a direction to the direction of the center line of the connection port, and reaching the connection port, wherein the expanding portion is provided in the direction-changing portion, wherein the intake passage includes a supercharging passage in which a supercharger for raising a pressure of the intake air introduced into the combustion chambers is arranged and a bypass passage connecting an upstream side with a downstream side of the supercharger for leading the intake air to the combustion chambers while bypassing the supercharger, wherein the EGR passage is connected with the bypass passage of the intake passage, wherein the air intake device comprises an EGR valve of a poppet type, the EGR valve being provided to the connection port and adjusting a returning amount of the EGR gas, and wherein a valve shaft of the EGR valve passes through the bypass passage. an intake passage for leading intake air to combustion chambers of a multi-cylinder engine; an exhaust passage for discharging exhaust gas from the combustion chambers; and an EGR passage connecting the intake passage with the exhaust passage for returning a portion of the exhaust gas as EGR gas from the exhaust passage to the intake passage, wherein the EGR passage includes, in a position close to a connection port to the intake passage, an expanding portion in which a passage cross-sectional area expands and which lowers a flow speed of the EGR gas so as to reduce an uneven flow, in the connection port, of the EGR gas flowing into the intake passage, wherein the EGR passage includes a passage portion extending toward the connection port and in a direction intersecting with the intake passage and intersecting with a center line of the connection port and a direction-changing portion being continuous with the passage portion, changing a direction to the direction of the center line of the connection port, and reaching the connection port, wherein the expanding portion is provided in the direction-changing portion, wherein the intake passage includes a supercharging passage in which a supercharger for raising a pressure of the intake air introduced into the combustion chambers is arranged and a bypass passage connecting an upstream side with a downstream side of the supercharger for leading the intake air to the combustion chambers while bypassing the supercharger, wherein the EGR passage is connected with the bypass passage of the intake passage, wherein the air intake device comprises an EGR valve of a poppet type, the EGR valve being provided to the connection port and adjusting a returning amount of the EGR gas, and wherein a valve shaft of the EGR valve passes through the bypass passage.