| 摘要 |
The present invention provides an optical scanning device (28YM, 28CK) that can suppress irregularity of the rotation of a polygon mirror (54) and an image forming 5 apparatus (10) that is disposed with this optical scanning device (28YM, 28CK). The optical scanning device (28CK) comprises: a rotating polygon mirror (54) that rotates and deflects light that has been emitted from a light source (40); and a plate member (104) that covers one surface of surfaces intersecting an axial direction of a rotating shaft (86) of the rotating polygon mirror (54), wherein a projecting portion (110) that projects 10 in the axial direction of the rotating shaft (86) away from the rotating polygon mirror (54) is disposed in the plate member (104). 0U-' < I I |
