An engine (1, 201) provided with an exhaust device comprising: an exhaust emission control catalyst provided in an exhaust passage of the engine (1, 201); a particulate collection filter disposed on a downstream side of the exhaust passage in an exhaust flow direction from the exhaust emission control catalyst and is adjacent to the exhaust emission control catalyst; and a connection passage that connects the exhaust emission control catalyst and the particulate collection filter to each other, wherein the connection passage partially has a small cross-sectional area portion a flow passage cross-sectional area of which is smaller than an area of the transverse section of the particulate collection filter, an enlarged portion is formed in a connection portion with the particulate collection filter in the connection passage, the enlarged portion having a flow passage cross-sectional area enlarged from upstream to downstream in the exhaust flow direction so as to be as large as the area of the transverse section of the particulate collection filter, and a guide wall portion is provided in the enlarged portion to allow exhaust gas having passed through the small cross-sectional area portion to swirl along a peripheral wall of the enlarged portion; and characterized in that the particulate collection filter has a transverse section having a flat shape and including a pair of opposing short sides and a pair of opposing long sides, the exhaust emission control catalyst is supported to a side wall portion of an engine body of the engine so as to extend in a cylinder row direction, the particulate collection filter is disposed below the exhaust emission control catalyst, extends in the cylinder row direction, and is supported to the side wall portion of the engine body such that the pair of long sides in the flat shape extends in a vertical direction, the connection passage is connected to the exhaust emission control catalyst and the particulate collection filter such that the small cross-sectional area portion extends in the vertical direction, and the guide wall portion is formed at a portion on the peripheral wall of the enlarged portion far from the side wall portion of the engine body, extends in the vertical direction, and is curved downward so as to approach the side wall portion of the engine body. an exhaust emission control catalyst provided in an exhaust passage of the engine (1, 201); a particulate collection filter disposed on a downstream side of the exhaust passage in an exhaust flow direction from the exhaust emission control catalyst and is adjacent to the exhaust emission control catalyst; and a connection passage that connects the exhaust emission control catalyst and the particulate collection filter to each other, wherein the connection passage partially has a small cross-sectional area portion a flow passage cross-sectional area of which is smaller than an area of the transverse section of the particulate collection filter, an enlarged portion is formed in a connection portion with the particulate collection filter in the connection passage, the enlarged portion having a flow passage cross-sectional area enlarged from upstream to downstream in the exhaust flow direction so as to be as large as the area of the transverse section of the particulate collection filter, and a guide wall portion is provided in the enlarged portion to allow exhaust gas having passed through the small cross-sectional area portion to swirl along a peripheral wall of the enlarged portion; and characterized in that the particulate collection filter has a transverse section having a flat shape and including a pair of opposing short sides and a pair of opposing long sides, the exhaust emission control catalyst is supported to a side wall portion of an engine body of the engine so as to extend in a cylinder row direction, the particulate collection filter is disposed below the exhaust emission control catalyst, extends in the cylinder row direction, and is supported to the side wall portion of the engine body such that the pair of long sides in the flat shape extends in a vertical direction, the connection passage is connected to the exhaust emission control catalyst and the particulate collection filter such that the small cross-sectional area portion extends in the vertical direction, and the guide wall portion is formed at a portion on the peripheral wall of the enlarged portion far from the side wall portion of the engine body, extends in the vertical direction, and is curved downward so as to approach the side wall portion of the engine body.