A refrigerant distribution device 10 is provided for distributing refrigerant to a plurality of heat transfer tubes 3 that constitute a heat exchanger 1. The refrigerant distribution device 10 includes a first distribution device 20 dividing refrigerant into a plurality of portions, and a plurality of two-way branch pipes 30 each dividing refrigerant divided by the first distribution device 20 into two portions to flow into two of the plurality of heat transfer tubes 3.