a highly reliable resin - molded stator not suffering insulation breakdown between different phases of stator coils even when the operation mode is repeated where the output of a rotary machine using a resin - molded stator is to be increased from the level under a stopped status to the maximum achievable level within a short time . also provided are methods of manufacturing such a stator , and a rotary machine using the same . the a resin - molded stator of the invention comprises a stator core , electrically insulated stator coils wound around the plurality of slots or protrusions provided in the axial direction of the stator core , and molding resin with which are molded the stator core and the stator coils located at the aforementioned slots or protrusions . at the stator core end , non - adhesive structure is established between the molding resin and at least one of the end faces of the stator core .