The anechoic room is one type of rooms used in the acoustic laboratory. The design of this room is distinctive and must be carried out to certain standards. The main components of these rooms are sound absorbing wedges, panels, vibration isolation system of the room floor. In this thesis, the structure of an anechoic room is designed with details. At first, sound absorbing wedges and parameters affecting their absorption were studied. The results showed that the wedge absorption was highly dependent on the poroacoustic material and geometry of the wedge. Therefore, according to the numerical results, the double wedge with a total height of 75 cm and a width of 40 cm and a square cross section were selected. The wedge cover is made of perforated panel that is formed as double wedge and fill with rock wool with density less than 30 kg/m 3 . The cutoff frequency of the designed wedge is about 100 Hz, regardless of the air layer behind it. The two layered wall with 10cm thick, was considered for wall and ceil with two 4mm steel sheets facing up and down. The floor panels are similar to the wall panels but have 6mm thick steel plate. The vibration system of the floor was designed according to the standard at 4 Hz. In design of spring tolerable tension, buckling and vibration were considered. Next, the air conditioning system was selected. A brief description of the control room and data analysis equipment was also provided. In the last chapter, a description of how to build a room, along with snapshots of its main parts together with the anechoic room plans were provided. Keywords : Absorbing wedge, Finite element method, Perforated panel, Semi anechoic chamber, Transmission loss