Exhaust gas purification device

An exhaust gas purification device that purifies an exhaust gas flowing through an exhaust passage of an engine, the exhaust gas purification device comprising:

• a tube-shaped casing;
• a pipe disposed at a downstream side of the casing, inserted into the casing so as to extend in a direction substantially perpendicular to an axial direction of the casing, and is provided with a through-hole communicating with the casing;
• a guide member for guiding the exhaust gas inside the casing to the through-hole;
• and
• an injection device for injecting into the pipe a reduction agent from an upstream end of the pipe,
• wherein the guide member includes a turning guide member guiding the exhaust gas to the through-hole from a tangential direction of the pipe so as to generate a swirl flow inside the pipe and a protecting guide member covering an upstream side of an injection area of the reduction agent in the axial direction of the casing.