Vehicle outside-mirror unit including lamp unit

A vehicle outside-mirror unit includes a mirror housing (4) having a window (10); and a lamp unit (11) included in the mirror housing (4). The lamp unit (11) includes a lamp housing (13) that divides a lamp chamber (12); a lamp lens (14); a light source that is fixed to the lamp lens (14) in the lamp chamber (12); a shielding portion that shields the light source; a light transmitting portion (20) that is provided at a position other than a position corresponding to the shielding portion of the lamp lens (14), and arranged at the window (10); and a reflection surface (21) that is provided in the lamp housing (13) in the lamp chamber (12), and reflects light from the light source to irradiate the light through the light transmitting portion (20) to outside.