This invention provides a microwave oven-compatible paper cup capable of preventing a thread end part from being burnt when the paper cup containing a content such as beverage and instant food is heated for cooking by a microwave oven, comprising a shell member (1) having a cylindrical shell part (11), a top curl part (12) formed by bending the upper end side of the shell part, and a folded part (13) formed by folding up the lower end of the shell part inward, and a bottom member (2) having a bottom surface part (20) and a bent part (22) formed by bending the outer peripheral edge part of thebottom surface part, wherein the bent part (22) is sandwiched between the shell part (11) and the folded part (13) to connect the shell member (1) to the bottom member (2), and the bottom surface part (20) is formed recessedly downward and including a lower surface section, which is almost flat.