Active energy irradiation device and inkjet printer

An active energy irradiation device comprising:

• a housing;
• an irradiation unit that is disposed in the housing, and is configured to irradiate active energy rays;
• a heat conduction member that is disposed in the housing, and is thermally connected to the irradiation unit;
• a first opening that is provided at the housing;
• and
• an air introduction unit that deflects air flowing into the housing along a first direction via the first opening to a second direction intersecting the first direction to introduce the air to the heat conduction member, wherein
• the air introduction unit includes
• a partition that is provided to face the first opening in the housing, and
• a filter that is provided between the first opening and the partition, and collects foreign substances contained in the air, and
• the filter includes
• a first filter portion that is provided on the heat conduction member side to come into contact with the partition without being exposed from the first opening as viewed from the first direction.