A securing structure with a stator, comprising: the stator including a stator core; and a housing having an opening portion containing said stator core, said opening portion of said housing including in an axial direction of said stator core along the outer circumferential surface of the stator core, a first portion where an inner diameter of said opening portion defined by the inner circumferential surface of the said opening portion is constant, and a second portion opposite to the other end in the axial direction of said stator core and formed apart from said stator core while being directly opposite to said stator core, and a clearance between an inner circumferential surface of said opening portion and the outer circumferential surface of said stator core in said second portion being set larger than a clearance between the inner circumferential surface of said opening portion and the outer circumferential surface of said stator core in said first portion, said stator core being formed by stacking sheet-shaped magnetic bodies, said stator core having a hole extending in the axial direction of said stator core along said second portion and said first portion, said stator core being secured to said housing by securing to said housing an end portion of a fastening member inserted into said hole to extend from said second portion to said first portion, and the other end portion of said fastening member, that is located opposite to said end portion of said fastening member, being non-supported by said housing, and said fastening member being supported in cantilever manner at said end portion of said fastening member. the stator including a stator core; and a housing having an opening portion containing said stator core, said opening portion of said housing including in an axial direction of said stator core along the outer circumferential surface of the stator core, a first portion where an inner diameter of said opening portion defined by the inner circumferential surface of the said opening portion is constant, and a second portion opposite to the other end in the axial direction of said stator core and formed apart from said stator core while being directly opposite to said stator core, and a clearance between an inner circumferential surface of said opening portion and the outer circumferential surface of said stator core in said second portion being set larger than a clearance between the inner circumferential surface of said opening portion and the outer circumferential surface of said stator core in said first portion, said stator core being formed by stacking sheet-shaped magnetic bodies, said stator core having a hole extending in the axial direction of said stator core along said second portion and said first portion, said stator core being secured to said housing by securing to said housing an end portion of a fastening member inserted into said hole to extend from said second portion to said first portion, and the other end portion of said fastening member, that is located opposite to said end portion of said fastening member, being non-supported by said housing, and said fastening member being supported in cantilever manner at said end portion of said fastening member.