A radial air gap rotary machine, comprising: a rotatable rotor; and a resin-molded stator, wherein the stator includes: a stator core formed by laminating steel sheets, the stator core including a plurality of tooth portions facing to the rotor and a yoke portion; a coil housed in a slot portion formed between the adjacent tooth portions by concentratedly winding; and a mold portion formed by resin molding, wherein the yoke portion includes multiple units disposed circumferentially, the tooth portion includes: a first portion facing to the rotor, that includes a first surface facing to the rotor where an air gap with the rotor becomes a first distance; and second portions facing to the rotor provided at both sides of the first portion in a circumferential direction, wherein the second portions are integral with the first portion, and each of the second portion includes a second surface facing to the rotor where the air gap with the rotor becomes a second distance wider than the first distance, and wherein the mold portion includes a first mold portion which includes a third surface facing to the rotor where the air gap with the rotor becomes the first distance, characterized in that each of the second portion includes, on the second surface, a groove portion extending in a lamination direction where the steel sheets are laminated, which is the same direction of an axis of rotation of the rotor, wherein the groove portion is provided starting from a boundary position where the first surface and the second surface are adjacent to each other in the circumferential direction, and the first mold portion covers the second portion and is provided at the groove portion, wherein the first portion is not covered by the mold portion. a rotatable rotor; and a resin-molded stator, wherein the stator includes: a stator core formed by laminating steel sheets, the stator core including a plurality of tooth portions facing to the rotor and a yoke portion; a coil housed in a slot portion formed between the adjacent tooth portions by concentratedly winding; and a mold portion formed by resin molding, wherein the yoke portion includes multiple units disposed circumferentially, a stator core formed by laminating steel sheets, the stator core including a plurality of tooth portions facing to the rotor and a yoke portion; a coil housed in a slot portion formed between the adjacent tooth portions by concentratedly winding; and a mold portion formed by resin molding, wherein the yoke portion includes multiple units disposed circumferentially, the tooth portion includes: a first portion facing to the rotor, that includes a first surface facing to the rotor where an air gap with the rotor becomes a first distance; and second portions facing to the rotor provided at both sides of the first portion in a circumferential direction, wherein the second portions are integral with the first portion, and each of the second portion includes a second surface facing to the rotor where the air gap with the rotor becomes a second distance wider than the first distance, and wherein the mold portion includes a first mold portion which includes a third surface facing to the rotor where the air gap with the rotor becomes the first distance, a first portion facing to the rotor, that includes a first surface facing to the rotor where an air gap with the rotor becomes a first distance; and second portions facing to the rotor provided at both sides of the first portion in a circumferential direction, wherein the second portions are integral with the first portion, and each of the second portion includes a second surface facing to the rotor where the air gap with the rotor becomes a second distance wider than the first distance, and wherein the mold portion includes a first mold portion which includes a third surface facing to the rotor where the air gap with the rotor becomes the first distance, characterized in that each of the second portion includes, on the second surface, a groove portion extending in a lamination direction where the steel sheets are laminated, which is the same direction of an axis of rotation of the rotor, wherein the groove portion is provided starting from a boundary position where the first surface and the second surface are adjacent to each other in the circumferential direction, and the first mold portion covers the second portion and is provided at the groove portion, wherein the first portion is not covered by the mold portion.