The present invention relates to an armrest member for a sitting-type thermotherapy device. The present invention mainly comprises a first parts storage box installed outside a body part having a certain thickness and a second parts storage box installed inside the body part. The first parts storage box comprises: a space portion which can receive thermal appliances of the sitting-type thermotherapy device; an opening-shutting cover which can open or shut the inside of the space portion against the outside; a finger insertion portion which is formed above the opening-shutting cover and forms a space capable of allowing the insertion of a user's finger; and a hinge spring which is formed below the opening-shutting cover. The first parts storage box can further comprise a connector portion which can be connected to a power cable. Meanwhile, the second parts storage box has a space portion capable of receiving a remote controller, and is formed between the armrest part and the first parts storage box.