An image projection optical module including: an image generating element configured to generate an image; an image display unit configured to display the image; and a coupling member thermally connected to the image generating element, the coupling member including a front heat dissipation portion on a front portion of the coupling member when a direction of line of sight of a user wearing a casing of a head mounted display provided with the image projection optical module is defined as a forward direction, the front heat dissipation portion being to dissipate heat.