An inlet port (17A) of a first exhaust gas purifying device (16) is provided on a side opposite to an engine (8) by sandwiching an axis (O1-O1) of a cylindrical body (17) of the first exhaust gas purifying device (16). An exhaust pipe (26) connecting the engine (8) and the first exhaust gas purifying device (16) is constituted by a lateral pipe line (27) extending in a left and right direction of an upper revolving structure (3) on a front side of the first exhaust gas purifying device (16) and having a bellows pipe (28) in the middle for absorbing relative displacement between the engine (8) and the first exhaust gas purifying device (16) and a bent pipe line (29) bent having a U-shape rearward from a tip end side of the lateral pipe line (27) and connected to the inlet port (17A) of the first exhaust gas purifying device (16).