Monocular type image display device

A monocular type image display device comprising:

• a frame body having a front portion which is positioned in front of eyes of a user and is supported on a nose of the user, and a pair of temple portions which is connected to a left side edge and a right side edge of the front portion;
• and
• an image display unit having an image forming part which is configured to form an image based on an image signal and an eyepiece optical part which is configured to guide the image formed by the image forming part to one of the eyes of the user, wherein
• at least one of the pair of temple portions includes a mounting portion arranged adjacent to the front portion, and a wearing portion which is positioned behind the mounting portion and is supported on an ear, a temporal portion or an occipital portion of the user,
• a step in a height direction approximately orthogonal to a plane which includes the pair of temple portions is formed between the mounting portion and the wearing portion, and
• the image display unit is mounted on the mounting portion or the front portion arranged adjacent to the mounting portion.