Air-conditioning apparatus

An air-conditioning apparatus includes: a refrigeration cycle; an injection circuit for connecting between an injection port and a branching portion arranged between an indoor expansion valve and a main circuit expansion valve; an injection circuit expansion valve arranged in the injection circuit; an internal heat exchanger for exchanging heat between refrigerant flowing between the branching portion and the main circuit expansion valve and refrigerant depressurized by the injection circuit expansion valve; and an outdoor unit control device, the outdoor unit control device being configured to control an opening degree A of the main circuit expansion valve so as to satisfy Relation A+C=B×Gr, where A represents the opening degree of the main circuit expansion valve, C represents an opening degree of the injection circuit expansion valve, B represents a coefficient, and Gr represents a refrigerant circulating amount in the refrigeration cycle.