An image forming apparatus, comprising: an apparatus main body for performing a predetermined process on a sheet; a cover openable and closable relative to the apparatus main body; a light emitting unit provided in the apparatus main body and including an emission source for generating light, a control board for controlling the emission source and causing it to generate the light and wiring electrically connected to the control board; and a display member being a lens, provided in the cover and arranged to face the emission source; wherein the display member includes an incident portion on which the light is incident, an output portion extending to a first direction for outputting the light to the outside, a polarization surface polarizing the light incident on the incident portion, a light guide portion for guiding the light polarized by the polarization surface to the output portion and a diffuser for introducing the light guided by the light guide portion to the output portion while diffusing the light, wherein the light is incident on the incident portion from the emission source in a second direction (D0, D2) substantially perpendicular to the first direction, the polarization surface polarizes a direction of propagation of the light incident on the incident portion in the first direction, the light guide portion forms a light guide path extending along the output portion and guides the light in the first direction in the light guide path, the light guide portion includes a facing surface facing the output portion, wherein the facing surface has an irregular shape and is formed by an irregular surface facing the output portion and forms the diffuser, the light guide path is a light path defined between the output portion and the facing surface, the diffuser is the facing surface and is set to be able to guide the light in the second direction and diffuse the light substantially over the entire output portion. an apparatus main body for performing a predetermined process on a sheet; a cover openable and closable relative to the apparatus main body; a light emitting unit provided in the apparatus main body and including an emission source for generating light, a control board for controlling the emission source and causing it to generate the light and wiring electrically connected to the control board; and a display member being a lens, provided in the cover and arranged to face the emission source; wherein the display member includes an incident portion on which the light is incident, an output portion extending to a first direction for outputting the light to the outside, a polarization surface polarizing the light incident on the incident portion, a light guide portion for guiding the light polarized by the polarization surface to the output portion and a diffuser for introducing the light guided by the light guide portion to the output portion while diffusing the light, wherein the light is incident on the incident portion from the emission source in a second direction (D0, D2) substantially perpendicular to the first direction, the polarization surface polarizes a direction of propagation of the light incident on the incident portion in the first direction, the light guide portion forms a light guide path extending along the output portion and guides the light in the first direction in the light guide path, the light guide portion includes a facing surface facing the output portion, wherein the facing surface has an irregular shape and is formed by an irregular surface facing the output portion and forms the diffuser, the light guide path is a light path defined between the output portion and the facing surface, the diffuser is the facing surface and is set to be able to guide the light in the second direction and diffuse the light substantially over the entire output portion.