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; 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 the first opening row is located at a side closer to the first linear section than a center line of the annular coil in the longitudinal direction, the third opening row is located at a side closer to the second linear section than the center line, characterized in that the cover further has a second opening row including a plurality of second openings arranged in the longitudinal direction of the annular coil; the second opening row being located at the side closer to the first linear section than the center line of the annular coil in the longitudinal direction, and being located closer to the second linear section than the first opening row, wherein the cover includes a plurality of first guides located at the respective second openings, and the first guides are configured to guide gas from the second openings to a space in which the second linear section of the annular coil is placed. 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; 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 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; and a third opening row including a plurality of third openings arranged in the longitudinal direction of the annular coil, a first opening row including a plurality of first 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 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 the first opening row is located at a side closer to the first linear section than a center line of the annular coil in the longitudinal direction, the third opening row is located at a side closer to the second linear section than the center line, characterized in that the cover further has a second opening row including a plurality of second openings arranged in the longitudinal direction of the annular coil; the second opening row being located at the side closer to the first linear section than the center line of the annular coil in the longitudinal direction, and being located closer to the second linear section than the first opening row, wherein the cover includes a plurality of first guides located at the respective second openings, and the first guides are configured to guide gas from the second openings to a space in which the second linear section of the annular coil is placed.