Bis(n-propylammonium) lead tetrabromide (C3H7NH3)2PbBr4) is a new member of the family of perovskite-type layer compounds. It exhibits two structural phase transitions according to the phase sequence: phi (172 K) to to epsilon (283 K) to delta . These transitions are characterized by x-ray diffraction and Raman scattering. The epsilon -phase is embedded between two isomorphic phases phi , and delta ; the latter exhibits monoclinic cell symmetry, and the space group is P21/a (Z=2). The room-temperature phase delta is disordered. (p is the most ordered phase. The epsilon to phi transition is characterized by a noticeable decrease in the interlayer distance and a distortion of the PbBr6 octahedra. This transitional behaviour will be discussed and compared with those found in the literature for homologous compounds; the re-entrant phenomenon and other points of similarity suggest for instance an incommensurate structure for the epsilon -phase.