This invention relates to a treatment device that can be prevented from being displaced from a treatment site. The treatment device accommodates one or more heating elements that generate heat, and is attachable to a treatment site of a patient, the device comprising a body part formed of an inelastic and breathable material, and having one or more storage portions individually storing each heating element one or more band parts formed of an elastic and breathable material, and attached to the body part and a fastening means for fastening the one or more band parts wound around the treatment site.
