This bath is a sample remained from ancient baths of Birjand and now a part of that has been changed as Pouriaye Vali gymnasium to perform ancient. The bath is located at a site called Saraabmiandeh in the south of Chaharderakht sq. and is one of the two baths of the city the water of which has been supplied from the borough aqueduct. The entrance of the bath is located lower than the passage level and is linked to sarbine and then to binet via a corridor. In the middle of the interior space of binet, an octagonal cavity of one meter length is seen. The binet has been covered with a small dome and its lighting has been provided by and its air has been ventilated. Stove, fireplace, fuel storage, ash storage are among other spaces of Chaharderakht bath. The main materials used in the building are bricks, plaster, lime and mortar. Despite the elaborate architecture, this bath has no special decorations.