The invention relates to a picture frame comprising a first elongated frame part (10), a second elongated frame part (20), a third elongated frame part (30) and a fourth elongated frame part (40). Each elongated frame part (10, 20, 30, 40) comprises at a first end (11, 21, 31, 41) a connection element (15, 25, 35, 45) configured to releasably engage a receiving member (16, 26, 36, 46) arranged at a second end (12, 22, 32, 42) of another elongated frame part (10, 20, 30, 40). Each of said connection elements (15, 25, 35, 45) extends in a direction transversal to a longitudinal extension (L) of the elongated frame parts (10, 20, 30, 40), and the connection element (15, 25, 35, 45) comprises a guiding protrusion (15c, 25c, 35c, 45c) configured to guide the connection element (15, 25, 35, 45) into the receiving member (16, 26, 36, 46).