Abstract: A lounge chair comprising a male seat piece, a female seat piece and a fastener which removably secure the male seat piece to the female seat piece. Both male and female seat pieces comprise casing defining a substantially hexahedral case which is slightly arched in profile; a central part of a side of each of the male and female seat piece is provided with a semicircular cavity and an engaging bar spanning through each of the semicircular cavities; a circular hole is provided at each end beside the semicircular cavity; each of the circular holes of the male seat piece is inserted by a tube with a portion of which exposed to the external. The tubes of the male seat piece are inserted into the circular openings of the female seat piece. The fastener comprises a plurality of fixing plates and clamping plates which are hinged together by a spike, a fixing rod and some screw elements. The fastener has a plurality of hooking members which may be hooked to the engaging bar of the male and female seat pieces.