Abstract: A portable shelter including a plurality of sidewall framing sections, a plurality of connectors joining adjacent sidewall sections to form spaced parallel vertical sidewalls, a plurality of arched crossmembers joining the top portions and the end portions of the spaced vertical sidewalls, crossbrace members extending between adjacent end portions of the spaced sidewalls, and a covering of a flexible sheet material disposed over the assembled sidewall sections and arched crossmembers; the sidewall framing sections being formed of four straight lengths of tubing affixed perpendicular to each other with the ends of each length of tubing extending a significant distance beyond the crossing point thereof with lengths of tubing perpendicular thereto, certain of the sidewall framing sections being of a square configuration of equal height and width and having a length of tubing disposed intermediate and parallel to the lengths of tubing forming opposite sides of the sidewall sections, and other of the sidewall sect