Image forming apparatus and intermediate transfer member

An image forming apparatus comprising:

• an image bearing member configured to bear a toner image,
• an intermediate transfer member, onto which the toner image is to be transferred from the image bearing member, and which is movable,
• a detection unit configured to irradiate the toner image on the intermediate transfer member with light to detect reflected light;
• and
• a control unit configured to perform control of adjusting a condition for forming the toner image based on a detection result of the detection unit,
• wherein, in a surface of the intermediate transfer member, a plurality of grooves extending along a movement direction of the surface of the intermediate transfer member are formed side by side in a width direction of the intermediate transfer member intersecting the movement direction, and
• wherein grooves, formed within a range of the intermediate transfer member to which the light is irradiated by the detection unit with respect to at least the width direction, among the plurality of grooves are formed so that intervals each between adjacent grooves with respect to the width direction are changed within a predetermined range having a first area and a second area, the first area being an area in which an interval continuously increases as a position in the width direction changes in one direction in a coordinate system having a horizontal axis representing the position in the width direction and a vertical axis representing the interval, and the second area being an area in which an interval continuously degreases as a position in the width direction changes in the one direction in the coordinate system.