Abstract: Device (V) for catching rainwater from a downpipe (F) comprising an opening (11), a branch pipe (5) with a sickle-shaped water-catching blade (12) comprising two halves at the end, a support member (1) traversed by the branch pipe (5) and a retainer. The branch pipe (5) engaging into the opening (11) with the water-catching blade (12) placed in the downpipe, and wherein the downpipe (F) can be fixed in the area of the support member (1) covering the opening (11) by means of the retainer (H). The retainer (H) comprises at least one undercut engagement hook (17) that can be passed through the opening (11), and an engagement hook tensioning system (S) interconnected between the support member (1) and the engagement hook (17).