To provide steam supply equipment capable of preventing substantial reduction of steam supply pressure even when the amount of use of steam is increased, and performing an operation of high energy efficiency.

In this steam supply equipment having a low-pressure boiler 1 and a high-pressure boiler 11, joining and supplying the steam of two systems to a steam use portion 4, and supplying the steam generated in the high-pressure steam boiler 11 through an accumulator 7 and a decompressor 8, the low-pressure boiler 1 is provided with an operation control device 2 for generating the steam of a pressure zone higher than the steam pressure after pressure reduction by the decompressor 8 and lower than the steam pressure generated in the high-pressure steam boiler 11, a steam supply detecting device is disposed to detect the supply of steam from the accumulator 7 to the steam use portion 4, and the operation control device 2 increases the generation of steam in the low-pressure steam boiler 1 when the supply of steam from the accumulator 7 is detected.