A tire sensor according to the present disclosure is a tire sensor configured to be mountable on a tire inner surface. The tire sensor includes a sensor body including electronic circuitry including a detector configured to be able to detect tire information, and a cover body configured to cover at least a part of a periphery of the sensor body. The cover body includes a mounting surface configured to be mountable on the tire inner surface, and a side surface configured to rise from an outer edge of the mounting surface. In the side surface of the cover body, a concave portion is formed between the mounting surface and a height position of of a maximum sensor height in a sensor height direction orthogonal to the mounting surface.