To appropriately repair a pipe according to the leaking condition of a fluid leakage part, and improve the economy and workability of the pipe repairing work.

In a pipe repairing device to repair a fluid leakage part 1 of a joining part J in a pipe P for the pressurized fluid, a device body 2A capable of holding a sealing material 5 to be pressed into a space S of the fluid leakage part 1 is provided, and a pressing mechanism 6 capable of pressing the sealing material 5 into the space S, and a fitting mechanism 7 locking the device body 2A to the joining part J and securing the reaction by the pressing operation of the sealing material 5 are provided on the device body 2A.