Rotational speed detection sensor

A rotational speed detection sensor, comprising:

• a detecting portion having a terminal and a detecting member attached at the terminal so as to be positioned at a tip of the detecting portion and face a magnetized portion, the detecting portion detecting variations of a magnetic flux generated by a rotation of the portion to be detected, the magnetized portion being integrally rotatable with an axle;
• a fix portion fixed to an outer race of a bearing for the axle, the fix portion being formed by means of molding;
• and
• a case, a first end of which is closed and a second end of which is opened, including
• a housing portion being formed so as to recess toward the first end of the case from an opening portion side of the case, the housing portion housing the detecting member in such a manner that the detecting portion is inserted therein,
• wherein the terminal includes a positioning hole, and the detecting member is attached to the terminal at a position of the positioning hole, the detecting portion includes a positioning contact surface contacting the case in a direction in which the detecting portion is inserted into the case, and a position of the positioning contact surface is determined on the basis of the position of the positioning hole, and
• wherein the case includes a positioning portion for restricting the case from being moved within a mold in a direction toward the opening portion side of the case from the first end of the case and for securing a position of the fix portion to be formed within the mold.