The present invention relates to a U-shaped precast concrete (PC) girder having a widening stem part, and more specifically, to a U-shaped PC girder having a widening stem part which has a widening stem part lower than the height of a U-shaped PC girder and wider than the width of the girder and protrudes from both ends of the girder to prevent falling, reduce a girder depth, and resolve a shear problem. According to a proper embodiment of the present invention, the U-shaped PC girder having a widening stem part comprises: a U-shaped body having a prescribed length and a rectangular cross section, wherein a middle portion in a longitudinal direction has a U-shaped cross section whose upper portion is opened; a wing slab horizontally extended from upper ends of both sides of the U-shaped body in a lateral direction to the outside in the lateral direction; and a stem part disposed on both longitudinal ends of the U-shaped body and comprising a middle mounting part which is positioned on the middle portion of the U-shaped body in a width smaller than a width of the U-shaped body and protrudes downward from the upper end of the U-shaped body to a point separated at a prescribed distance, and a side mounting part which protrudes from both sides of the middle mounting part to the outside of the middle mounting part, has a length shorter than the protruding length of the middle mounting part from an end of the U-shaped body to widen to be wider than the U-shaped body by a prescribed length, wherein a sheath pipe penetrates into and is buried in the U-shaped body from one longitudinal end to the other longitudinal end of the U-shaped body.
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