To provide an exhaust emission control device that efficiently heats a whole fuel reforming catalyst, can regenerate a particulate filter by early increasing temperatures of an oxidation catalyst and the particulate filter even at a low exhaust temperature, shortens a rise time of a selective reduction type catalyst inlet temperature and can improve a NOx reduction ratio by early adding a reduction agent to the upstream side of the selective reduction type catalyst.

When a temperature of an oxidation catalyst 2 is an oxidation catalyst set temperature, microwaves generated by a microwave generating device 9 are emitted to a fuel reforming catalyst 8, so as to heat the fuel reforming catalyst 8 uniformly. When the temperature of the oxidation catalyst 2 is equal to or higher than the oxidation catalyst set temperature, in a temperature region in which generation of reformed gas is not required, the microwaves are emitted to the oxidation catalyst 2 and a particulate filter 3 switching from the fuel reforming catalyst 8.