A method for manufacturing an axial gap type rotating electric machine including: a stator in which a plurality of core units each having a magnetic flux surface in a rotation shaft direction are arranged annularly around a rotational axis; a rotor that faces the magnetic flux surface of the stator in an axial direction; a housing having an inner cylindrical space for storing the stator; wherein the housing has an annular thick portion along a part of the inner periphery of the inner cylinder space with a predetermined thickness toward an axial center side along the inner periphery; and a mold resin covering a part or a whole of the stator and integrally connecting the stator and the inner periphery of the inner cylindrical space, the method comprising: an arranging step of arranging the stator in the inner cylinder space at a position including an axial width of the stator within an axial width of the thick portion; a seal member arranging step of arranging an annular seal member so as to face an axial end portion of the thick portion, the seal member (15,15b) having an inner diameter substantially coinciding with an inner diameter of the axial end portion of the thick portion and having a shape changing in a radial direction by pressing from the axial direction; a pressing step of inserting a resin mold (Aa, Bb) having an outer diameter larger than an inner diameter of the thick portion from an axial opening of the inner cylinder space and pressing the seal member (15, 15b) against the axial end portion; and a sealing step of sealing the mold resin from a resin sealing port of the resin mold (Aa, Bb) on the stator side and integrally molding the stator and the inner periphery of the thick portion, wherein the pressing step comprises a pressing step of pressing the seal member (15, 15b) in the axial direction until a deformed end of the seal member in the axial center direction reaches a range from an axial side corner of an axial end surface of the thick portion to an axial center side. wherein the housing has an annular thick portion along a part of the inner periphery of the inner cylinder space with a predetermined thickness toward an axial center side along the inner periphery; and a mold resin covering a part or a whole of the stator and integrally connecting the stator and the inner periphery of the inner cylindrical space, the method comprising: an arranging step of arranging the stator in the inner cylinder space at a position including an axial width of the stator within an axial width of the thick portion; a seal member arranging step of arranging an annular seal member so as to face an axial end portion of the thick portion, the seal member (15,15b) having an inner diameter substantially coinciding with an inner diameter of the axial end portion of the thick portion and having a shape changing in a radial direction by pressing from the axial direction; a pressing step of inserting a resin mold (Aa, Bb) having an outer diameter larger than an inner diameter of the thick portion from an axial opening of the inner cylinder space and pressing the seal member (15, 15b) against the axial end portion; and a sealing step of sealing the mold resin from a resin sealing port of the resin mold (Aa, Bb) on the stator side and integrally molding the stator and the inner periphery of the thick portion, wherein the pressing step comprises a pressing step of pressing the seal member (15, 15b) in the axial direction until a deformed end of the seal member in the axial center direction reaches a range from an axial side corner of an axial end surface of the thick portion to an axial center side. an arranging step of arranging the stator in the inner cylinder space at a position including an axial width of the stator within an axial width of the thick portion; a seal member arranging step of arranging an annular seal member so as to face an axial end portion of the thick portion, the seal member (15,15b) having an inner diameter substantially coinciding with an inner diameter of the axial end portion of the thick portion and having a shape changing in a radial direction by pressing from the axial direction; a pressing step of inserting a resin mold (Aa, Bb) having an outer diameter larger than an inner diameter of the thick portion from an axial opening of the inner cylinder space and pressing the seal member (15, 15b) against the axial end portion; and a sealing step of sealing the mold resin from a resin sealing port of the resin mold (Aa, Bb) on the stator side and integrally molding the stator and the inner periphery of the thick portion, wherein the pressing step comprises a pressing step of pressing the seal member (15, 15b) in the axial direction until a deformed end of the seal member in the axial center direction reaches a range from an axial side corner of an axial end surface of the thick portion to an axial center side.