Position detection device, drive device, and lens barrel

A position detection device, comprising:

• a detection portion including a first magnetism detection element and a second magnetism detection element, the first magnetism detection element and the second magnetism detection element disposed on a first plane;
• and
• a magnetism generation portion disposed at a position opposite the detection portion, the magnetism generation portion including a first magnetized portion and a second magnetized portion,
• the first magnetized portion facing the first plane where the first magnetism detection element and the second magnetism detection element are disposed, the first magnetized portion having a first north pole and a first south pole,
• the second magnetized portion opposing at an opposite side with respect to a side that the first magnetized portion faces the detection portion, the second magnetized portion having a second north pole and a second south pole,
• the first north pole opposing the second south pole in a direction perpendicular to the first plane,
• the first south pole opposing the second north pole in the direction perpendicular to the first plane,
• a polarization line of the first magnetized portion or the second magnetized portion of the magnetism generation portion is disposed on a second plane different from the first plane;
• a line segment connecting the first magnetism detection element and the second magnetism detection element, and the polarization line of the first magnetized portion or the second magnetized portion of the magnetism generation portion are either a) skewed lines or b) parallel,
• the detection portion executes position detection of the detection portion relative to the magnetism generation portion with respect to two directions within the first plane that are perpendicular to each other.