Onboard device and attachment structure for onboard device

An onboard device comprising:

• a body member;
• a support member projecting from the body member and including a base to be attached to a concave inner surface of a glass member having a curved shape provided in a vehicle;
• and
• a double-sided adhesive tape prepared to be stuck on the base,
• wherein the base of the support member is a plate-like member including an attachment surface to be opposed to the inner surface of the glass member and a pillar-part formation surface provided with a pillar part connected to the body member on an opposite side of the attachment surface,
• the attachment surface is a curved surface having a curvature at least in a first direction along the attachment, surface and projecting toward an opposite side of the pillar-part formation surface,
• the double-sided adhesive tape is provided with a plurality of slits including at least one first slit open toward an upper edge located on an upper side when the base is attached to the inner surface and cut downward in a direction perpendicular to an axial line about which the base is rotated when attached to the inner surface, and at least one second slit open toward a lower edge located on a lower side and cut upward in the direction perpendicular to the axial line about which the base is rotated when attached to the inner surface, and
• wherein the double-sided adhesive tape is provided with guide parts at openings at the upper edge and the lower edge of the at least one first slit and the at least one second slit, each guide part having a greater width than the at least one first slit and the at least one second slit.