Fracturing for injecting material, and fracturing fluids

High safety, the dispersion state of the fluid and fracture support material is stable, provides decompose fracturing fluid, and fracturing for injecting material to be contained in it in a short period of time. Containing resin composition comprising at least hydrolyzable or biodegradable resin and starch, fracturing for injecting material, and the fracturing for injecting material, fracture support material having an average particle size of 0.1 to 3 mm, and a water a fracturing fluid containing.