Base plate, motor, and disk drive device

A base plate which is a portion of a housing of a disk drive device and is defined by a die-cast member comprising metal, the base plate comprising:

• a bottom wall extending perpendicularly to a rotation axis of a disk extending in an up-down direction;
• and
• a peripheral wall extending from a peripheral edge of the bottom wall to an axially upper side and surrounding a periphery of the bottom wall, wherein
• the bottom wall comprises a screw hole recessed from a peripheral edge of a lower end surface to the axially upper side,
• the screw hole comprises:
• an inclined part defined to have an inner diameter that decreases from a lower end toward the axially upper side;
• and
• a column body extending from an upper end of the inclined part to the axially upper side and defined with a threaded part to be screwed with a screw, and
• in a cross section comprising a center line that passes through a center of the column body and extends in an axial direction, the inclined part is inclined at an inclination angle of 25° or more and 35° or less with respect to the center line.