Abstract: In an exhaust gas purification apparatus (1) including a first exhaust gas treatment member (3) carrying an oxidation catalyst, a three-way catalyst, or a NOx storage reduction catalyst which is used for purifying exhaust gas from an internal combustion engine, in which a second exhaust gas treatment member (4) having a HC storing function is disposed on the downstream side of the first exhaust gas treatment member (3), a heat dissipating unit (5) is disposed between the first exhaust gas treatment member (3) and the second exhaust gas treatment member (4), an upstream side of the heat dissipating unit (5) is formed into a heat insulating structure, and a further upstream side thereof is formed into a heat retaining structure.