Rotation detection device and manufacturing method for the same

A manufacturing method for a rotation detection device, the rotation detection device comprising:

• a rotation detector component configured to detect a rotational state of a rotor and to send a rotational detection signal;
• a signal transmission component electrically connected with a lead frame of the rotation detector component and configured to transmit the rotational detection signal to an external device;
• a body portion holding the rotation detector component and a part of the signal transmission component;
• and
• a mount portion configured to mount the body portion,
• the manufacturing method comprising:
• joining the lead frame of the rotation detector component with the signal transmission component to form a joint portion between the lead frame and the signal transmission component;
• and
• forming the body portion of the first resin by integrally molding the joint portion, the rotation detector component, and a part of the signal transmission component, such that a plurality of corners of the rotation detector component has at least two exposed corners, which are exposed from the body portion.