Abstract: A toy building set comprising toy building elements provided with complementary coupling members, said toy building set comprising a first toy building element (1) having a through-going opening (3) and with coupling members (4) arranged in a plane perpendicular to the through-going opening (3), and a second, elongate toy building element (2) having an outer cross section that fits into the cross section of the through-going opening (3) in the first toy building element (1). The second toy building element (2) is provided with coupling members (4), at least at the one end, and securing members are provided for temporarily securing the second toy building element (2) in the first toy building element (1).