A cooling structure for a stator of a rotating electrical machine for supplying a refrigerant to stator coil ends, the cooling structure being equipped with an oil guide that is arranged in a casing of the rotating electrical machine, the oil guide comprising: an arc-shaped tube forming a first refrigerant passage therein, the arc-shaped tube being arranged in a plane perpendicular to the stator axis and being opposed to an axial end portion of a stator coil end, the arc-shaped tube being configured such that, during operation, the refrigerant is introduced into the first refrigerant passage; and a first refrigerant discharging portion that projects in a first axial direction from a surface of the arc-shaped tube toward the stator coil end of each unit coil, the first refrigerant discharging portion forming therein a second refrigerant passage communicating with the first refrigerant passage such that the refrigerant, during operation, passes from the first refrigerant passage to the second refrigerant passage, and then is discharged from a tip end of the first refrigerant discharging portion toward the stator coil end of each unit coil, characterized in that the oil guide further comprises a second refrigerant discharging portion positioned during operation above a bearing that supports a rotation shaft of the rotating electrical machine, the bearing being provided on an inner peripheral surface of the casing, the second refrigerant discharging portion projecting in a second axial direction, which is opposite to the first axial direction, from a surface of the arc-shaped tube and being configured to discharge the refrigerant from a tip end of the second refrigerant discharging portion toward the inner peripheral surface of the casing to supply the refrigerant for the cooling and lubrication of the bearing. an arc-shaped tube forming a first refrigerant passage therein, the arc-shaped tube being arranged in a plane perpendicular to the stator axis and being opposed to an axial end portion of a stator coil end, the arc-shaped tube being configured such that, during operation, the refrigerant is introduced into the first refrigerant passage; and a first refrigerant discharging portion that projects in a first axial direction from a surface of the arc-shaped tube toward the stator coil end of each unit coil, the first refrigerant discharging portion forming therein a second refrigerant passage communicating with the first refrigerant passage such that the refrigerant, during operation, passes from the first refrigerant passage to the second refrigerant passage, and then is discharged from a tip end of the first refrigerant discharging portion toward the stator coil end of each unit coil, characterized in that the oil guide further comprises a second refrigerant discharging portion positioned during operation above a bearing that supports a rotation shaft of the rotating electrical machine, the bearing being provided on an inner peripheral surface of the casing, the second refrigerant discharging portion projecting in a second axial direction, which is opposite to the first axial direction, from a surface of the arc-shaped tube and being configured to discharge the refrigerant from a tip end of the second refrigerant discharging portion toward the inner peripheral surface of the casing to supply the refrigerant for the cooling and lubrication of the bearing.