MOUNTING STRUCTURE AND MOUNTING BASE FOR ROTARY MOUNTING-TYPE WINDSHIELD MOUNTED IN-VEHICLE DEVICE

A mounting base is mounted to a windshield surface. A support stay is mounted to the mounting base via a support stay mounting leaf spring by being rotated in a direction around a rotation axis. A support stay mounting surface of the mounting base and a mounted surface of the support stay include abutment support structures. The abutment support structures bring the support stay mounting surface and the mounted surface into abutment with each other via a plurality of abutment support portions surrounding the rotation axis to make the support stay be supported on the mounting base. The abutment support portions include a first abutment support portion disposed in an angle direction toward a lower side of a circumference around the rotation axis with the rotation axis as a center.