Method of manufacturing housing structure and housing structure

A method of manufacturing a housing structure that includes an electronic unit including a first circuit portion and a second circuit portion protruding from the first circuit portion, and a housing in which the electronic unit is housed, the electronic unit and the housing being integral with each other, the method comprising:

• preparing a mold for insert molding in which the electronic unit is housed, the mold including an upper wall surface facing an upper surface of the second circuit portion and side wall surfaces facing side surfaces of the second circuit portion, the mold being configured such that a flow resistance of a resin flowing through a space between each of the side surfaces of the second circuit portion and the corresponding side wall surface is lower than a flow resistance of the resin flowing through a space between the upper surface of the second circuit portion and the upper wall surface;
• placing the electronic unit in the mold;
• and
• injecting the resin into the mold in which the electronic unit has been placed, wherein
• the electronic unit is used as a torque sensor mounted in a vehicle,
• the first circuit portion of the electronic unit includes a magnetic convergence ring having an annular shape and a magnetic convergence ring holder surrounding the magnetic convergence ring,
• the second circuit portion of the electronic unit includes an electronic circuit portion including an electronic component, and
• the electronic unit is placed in the mold such that an inner peripheral surface of the magnetic convergence ring holder is supported by a support portion protruding in the mold.