1. A refrigerant distribution device to distribute a refrigerant supplied from an upper stream comprising:a main body including a side wall part, an upper face part and a bottom face part;
an upstream pipe provided on the upper face part in a manner communicating with an inside of the main body;
a downstream pipe provided in a state partially inserted inside the main body via an under face hole part provided in the bottom face part, wherein, an upper end of the downstream pipe facing the upstream pipe is closed with a refrigerant direction changer and a refrigerant inflow port is provided on a side face of the downstream pipe below the upper end; and
a tributary pipe provided on the side wall part or the bottom face part in a manner communicating with the inside of the main body.