<p>A support leg for facilitating installation of a waterproof pan and reliably horizontally supporting the pan. The support leg (10) is placed between the waterproof pan (5a) and an installation surface (1) and supports the waterproof pan (5a) on the installation surface (1). The support leg (10) has a support member (8) extending vertically from the lower surface of the pan (5a); a tubular member (9), one end of which has an opening (9a) into which the support member (8) is insertable and the other end of which is closed; an elastic member (11) provided between the support member (8) and the tubular member (9) and having elastic force in the direction where the support and tubular members are separated from each other; and a hardening material (12) placed inside the tubular member (9) and hardens with time.</p>
