Variable resistor, method for manufacturing variable resistor, and rotational angle sensor

The present invention addresses the problem of providing a variable resistor, a method for manufacturing a variable resistor, and a rotation angle sensor, whereby it is possible to improve the durability of a resistance pattern and the close contact of the resistance pattern with respect to a substrate without losing the releasability of the substrate with respect to a mold. A variable resistor according to one embodiment of the present invention is characterized by being provided with: a molded substrate having a first surface on which a resistance pattern is provided; and a slider in sliding contact with the resistance pattern, the slider having a contact piece in contact with the resistance pattern at a predetermined contact width, the first surface of the molded substrate having a plurality of protrusions, and the contact width of the contact piece being wider than the arrangement interval of the plurality of protrusions. 本发明的课题是提供一种能够不损失基板相对于模具的离模性地使电阻图案相对于基板的紧密接触性以及电阻图案的耐久性提高的可变电阻器、可变电阻器的制造方法以及旋转角度传感器。发