Construction machine

A construction machine comprising an automotive vehicle body, an engine mounted on said vehicle body, a hydraulic pump provided on one longitudinal side of said engine, and an exhaust gas purifying device connected to said engine through an exhaust pipe to purify exhaust gas, and

• said exhaust gas purifying device comprising an upstream cylinder connected to said exhaust pipe, a downstream cylinder disposed downstream of said upstream cylinder to emit the exhaust gas, a filter cylinder provided between said upstream cylinder and said downstream cylinder and accommodating a filter for trapping particulate matter contained in the exhaust gas, an upstream side pressure conduit mounted on said upstream cylinder to guide pressure within said upstream cylinder to an outside, a downstream side pressure conduit mounted on said downstream cylinder to guide pressure within said downstream cylinder to the outside, and a pressure sensor connected to these conduits to detect the front and rear pressures of said filter, said construction machine characterized in that:
• said upstream cylinder and said downstream cylinder are fixedly provided on said vehicle body,
• said filter cylinder is provided mountably and dismountably with respect to said upstream cylinder and said downstream cylinder, and
• said upstream side pressure conduit, said downstream side pressure conduit and said pressure sensor are arranged to be disposed at positions offset from a moving path which is used when said filter cylinder is dismounted from said upstream cylinder and said downstream cylinder and is moved to another location or is returned from the other location and is remounted thereto so as to perform maintenance operation of said filter cylinder.