Exhaust Treatment Device

An exhaust treatment device that treats an exhaust gas from an internal combustion engine, the exhaust treatment device comprising:

• a cylindrical shell into which the exhaust gas is introduced;
• and
• a flow channel pipe inserted in such a manner as to penetrate through the cylindrical shell,
• wherein the exhaust treatment device is configured such that one end of the flow channel pipe is connected to an exhaust-gas flow path of the internal combustion engine and the exhaust gas flowing through the exhaust-gas flow path is introduced into the cylindrical shell via the flow channel pipe,
• wherein a pair of through holes, in which the flow channel pipe is disposed, are provided in a pipe wall of the cylindrical shell,
• wherein a lid member configured to occlude one of the through holes is welded to an other end of the flow channel pipe so as to occlude an opening in the other end of the flow channel pipe, and
• wherein the lid member is welded to the pipe wall of the cylindrical shell so that the one of the through holes is occluded by the lid member.