Physique estimation device and posture estimation device

A posture estimation device comprising:

• a camera configured to capture an image of an inside of a vehicle;
• and
• circuitry configured to:
• acquire positions of a plurality of skeleton points of a body image of an occupant included in a captured image obtained by capturing an image of the inside by the camera as skeleton point coordinates in a two-dimensional coordinate system of the captured image;
• acquire a position of a seat base and a leaning posture of a seat back of a seat in the vehicle;
• correct the skeleton point coordinates in the two-dimensional coordinate system of the captured image based on the position of the seat base and the leaning posture of the seat back;
• and
• estimate, with reference to machine learned data, a posture of the occupant based on distance information that is a distance between a plurality of preset skeleton points among the plurality of skeleton points specified by the skeleton point coordinates and angle information that is an angle of a skeleton line obtained by connecting the plurality of the skeleton points specified by the corrected skeleton point coordinates with respect to a reference line.