An armature molded structure comprising: a cylindrical iron core used for a molded structure of a motor armature; a winding; and molding resin, wherein the iron core includes first core sheets and second core sheets, the first core sheet includes first magnetic poles placed along a circumferential direction of the iron core, tip portions, on an inner peripheral side of the iron core, of adjacent first magnetic poles form a coupling portion coupling the adjacent first magnetic poles, the second core sheet includes second magnetic poles placed along the circumferential direction of the iron core, tip portions, on the inner peripheral side of the iron core, of adj acent second magnetic poles form a non-coupling portion separating the adjacent second magnetic poles, the first and second core sheets are laminated along a central axis direction of the iron core in such a manner that the coupling portions coincide with each other, the non-coupling portions coincide with each other, the coupling portion and the non-coupling portion coincide with each other, the winding is wound around the first and second magnetic poles of the laminated first and second core sheets, the first and second core sheets and the winding are molded with the molding resin, the non-coupling portion delimits an opening window portion in an inner peripheral surface of the iron core, and the opening window portion is filled with the molding resin; wherein each end of the iron core is provided with a ring-shaped resin molded end portion, wherein protruding portions are intermittently formed in a circumferential direction on an inner peripheral surface side of the resin molded end portion, such that an end portion of the inner peripheral surface of the iron core is exposed in the recessed portions that are located between the protruding portions, whereby an uneven surface structure is formed on the inner peripheral surface of the resin molded end portion, and a recessed portion of the uneven surface structure forms a flow path for pouring resin into the opening window portion. a cylindrical iron core used for a molded structure of a motor armature; a winding; and molding resin, wherein the iron core includes first core sheets and second core sheets, the first core sheet includes first magnetic poles placed along a circumferential direction of the iron core, tip portions, on an inner peripheral side of the iron core, of adjacent first magnetic poles form a coupling portion coupling the adjacent first magnetic poles, the second core sheet includes second magnetic poles placed along the circumferential direction of the iron core, tip portions, on the inner peripheral side of the iron core, of adj acent second magnetic poles form a non-coupling portion separating the adjacent second magnetic poles, the first and second core sheets are laminated along a central axis direction of the iron core in such a manner that the coupling portions coincide with each other, the non-coupling portions coincide with each other, the coupling portion and the non-coupling portion coincide with each other, the winding is wound around the first and second magnetic poles of the laminated first and second core sheets, the first and second core sheets and the winding are molded with the molding resin, the non-coupling portion delimits an opening window portion in an inner peripheral surface of the iron core, and the opening window portion is filled with the molding resin; wherein each end of the iron core is provided with a ring-shaped resin molded end portion, wherein protruding portions are intermittently formed in a circumferential direction on an inner peripheral surface side of the resin molded end portion, such that an end portion of the inner peripheral surface of the iron core is exposed in the recessed portions that are located between the protruding portions, whereby an uneven surface structure is formed on the inner peripheral surface of the resin molded end portion, and a recessed portion of the uneven surface structure forms a flow path for pouring resin into the opening window portion.