Exhaust purification device

An exhaust purification device having a catalytic converter into which exhaust gas flows, the catalytic converter comprising:

• an inner cylinder having an upstream end portion and a downstream end portion, the inner cylinder holding a catalyst support for purifying the exhaust gas;
• and
• an outer cylinder having an upstream end portion and a downstream end portion, the outer cylinder disposed with a gap to an outer periphery of the inner cylinder so as to surround the outer periphery of the inner cylinder;
• wherein
• the inner cylinder is slidably held via a first heat-insulating member having an elastic force to the upstream end portion of the outer cylinder in a flow direction of the exhaust gas of the outer cylinder, and is fixed by being welded to the downstream end portion of the outer cylinder in the flow direction of the exhaust gas of the outer cylinder;
• and
• the exhaust gas having passed through the catalyst support flows into the gap between the inner cylinder and the outer cylinder through an opening end between the downstream end portion of the inner cylinder and the downstream end portion of the outer cylinder in the flow direction of the exhaust gas.