A sensor case (10) with a sensor housed therein for obtaining information on a tire, including a lower side member (11) having a bottom surface (11b) to be attached on an inner surface of the tire or to a base (20) for mounting the sensor case (10) on the inner surface of the tire, and an upper side member (12) protruding from a surface (11a) opposite to the bottom surface (11b) of the lower side member (11) to a side opposite to the bottom surface (11b) and having a width smaller than a width of the lower side member (11). A side surface (11c) of the lower side member (11) is formed of a curved surface convex outwardly in a width direction, and a side surface (12c) of the upper side member (12) and a top surface (12a) of the upper side member (12), which is a surface opposite to the bottom surface (11b), are connected by a curved surface (12p) being in contact with the top surface (12a).