PROBLEM TO BE SOLVED: To provide a frozen plasma thawing device which is capable of safely and sanitarily thawing frozen plasma stored in a frozen plasma bag in a short time without using hot water, is simply configured, is compact, is excellent in handleability, is highly reliable in temperature management, is durable, and is at a low price.SOLUTION: A device is a frozen plasma thawing device 1 for thawing frozen plasma stored in a frozen plasma bag 2, and includes: a pair of melting plates 3a and 3b which are formed of a material having high thermal conductivity, and hold the frozen plasma bag and a swinging means for swinging at least one melting plate of the pair of the melting plates holding the frozen plasma bag therebetween. The pair of melting plates have heaters 5a and 5b for heating the melting plates and temperature sensors 6a and 6b for detecting the temperature of the melting plates, respectively, and a temperature regulation means 31 for regulating the melting plates to a prescribed temperature by adjusting supply power of the heaters on the basis of the detection value of the temperature sensors is included.
