In a blood transfusion system (a blood transfusion kit, a blood transfusion kit for emergency blood transfusion, or a method of using a blood transfusion kit) (10), a flow path (16) through which blood flows is formed using a tube (12) having a channel (14) therein. The flow path (16) includes: a first path (80) that connects an upstream path (60) and a downstream path (70) and has a leukocyte removal filter (82) removing leukocytes at an intermediate position of the channel (14); and a second path (90) that connects the upstream path (60) and the downstream path (70) and bypasses the leukocyte removal filter (82).
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