Fixing device and image forming apparatus

A fixing device comprising:

• a fixing member configured to fix an image onto a sheet;
• and
• an induction heating section configured to inductively heat the fixing member,
• the induction heating section including:
• an annular coil elongated in a direction perpendicular to a conveyance direction of the sheet;
• an arched core section including a plurality of arched cores arranged in a longitudinal direction of the annular coil and disposed so as to straddle the annular coil;
• and
• a cover that covers the arched core section,
• the cover having:
• a first opening row including a plurality of first openings arranged in the longitudinal direction of the annular coil;
• a second opening row including a plurality of second openings arranged in the longitudinal direction of the annular coil;
• and
• a third opening row including a plurality of third openings arranged in the longitudinal direction of the annular coil,
• the annular coil including:
• a first linear section extending in the longitudinal direction of the annular coil;
• and
• a second linear section extending opposite to the first linear section, wherein
• both the first opening row and the second opening row are located at a side closer to the first linear section than a center line of the annular coil in the longitudinal direction,
• the second opening row is located closer to the second linear section than the first opening row, and
• the third opening row is located at a side closer to the second linear section than the center line.