The invention provides a refrigerating fluid splitter and a refrigeration cycle device. The purpose is that stable brazing can be carried out without blocking of a splitting pipe and insufficient soldering flux inflow, and even if the refrigerating fluid splitter is exposed in a harsh surrounding environment, unfavorable conditions of leakage of gases from a connection position and the like will not happen. The refrigerating fluid splitter has pipe insertion sections for insertion and fixing of the splitting refrigerating fluid pipes and a splitter main body equipped with a plurality of pipe insertion sections in a protruding way. The pipe insertion section has a thick wall section with a thick wall and a thin wall section with a wall being thinner than the wall of the thick wall section.
