A feed water pipe for a steam generator, the feed water pipe comprising: a generator internal pipe section that is configured to extend in the horizontal direction inside the steam generator and includes a pipe path configured to accommodate circulation of cooling water supplied from the outside of the steam generator; a communication pipe section that is connected to the generator internal pipe section and is provided with a communication path which is configured to allow communication between the pipe path and a space outside the generator internal pipe section inside the steam generator; an insertion pipe section configured to be inserted into a penetration hole penetrating an outer shell member of the steam generator and that extends in the horizontal direction; and a connection pipe section that is provided between the insertion pipe section and the generator internal pipe section, characterized in that the connection pipe section is bent with respect to the insertion pipe section so as to raise the generator internal pipe section and is configured to introduce the cooling water supplied from the outside of the steam generator from the insertion pipe section to the pipe path, wherein one end of the communication path is connected to the pipe path at an upper end of a cross-section perpendicular to a flow direction of the cooling water in the pipe path and another end of the communication path is positioned lower than the one end of the communication path in a vertical direction, and wherein the upper end of the cross-section perpendicular to the flow direction of the cooling water of the pipe path is positioned upper than an upper end of an inner wall surface of the insertion pipe section in the vertical direction, and wherein the other end of the communication path is positioned lower than the upper end of the inner wall surface of the insertion pipe section in the vertical direction. a generator internal pipe section that is configured to extend in the horizontal direction inside the steam generator and includes a pipe path configured to accommodate circulation of cooling water supplied from the outside of the steam generator; a communication pipe section that is connected to the generator internal pipe section and is provided with a communication path which is configured to allow communication between the pipe path and a space outside the generator internal pipe section inside the steam generator; an insertion pipe section configured to be inserted into a penetration hole penetrating an outer shell member of the steam generator and that extends in the horizontal direction; and a connection pipe section that is provided between the insertion pipe section and the generator internal pipe section, characterized in that the connection pipe section is bent with respect to the insertion pipe section so as to raise the generator internal pipe section and is configured to introduce the cooling water supplied from the outside of the steam generator from the insertion pipe section to the pipe path, wherein one end of the communication path is connected to the pipe path at an upper end of a cross-section perpendicular to a flow direction of the cooling water in the pipe path and another end of the communication path is positioned lower than the one end of the communication path in a vertical direction, and wherein the upper end of the cross-section perpendicular to the flow direction of the cooling water of the pipe path is positioned upper than an upper end of an inner wall surface of the insertion pipe section in the vertical direction, and wherein the other end of the communication path is positioned lower than the upper end of the inner wall surface of the insertion pipe section in the vertical direction.