A floor support device (1; 101; 201; 301; 401) for use together with a floor joist, said floor support device comprises a level adjustment device (12; 112; 212; 312; 412), a joist attachment device (13; 113; 213; 313; 413), said level adjustment device (12; 112; 212; 312; 412) comprises, a level adjustment screw, an adjustment block (15; 115; 215; 315; 415), said level adjustment screw comprises a first part intended to contact an underlying surface and a second part adapted to engage with said adjustment block (15; 115; 215; 315; 415), further said joist attachment device (13; 113; 213; 313; 413) comprises at least one first engagement means (27; 127; 227; 327; 427) and said adjustment block (15; 115; 215; 315; 415) comprises at least one second engagement means (28; 128; 228; 328; 428), which first and second engagement means (27, 28; 127, 128; 227, 228; 327, 328; 427, 428) are complementary with each other and are adapted to engage with each other in an assembled state, further said joist attachment device (13; 113, 213; 313; 413) comprises an engagement part (22; 122; 222; 322; 422) adapted to be attached to a floor joist, and said floor support device (1;101; 201; 301; 401) further comprises a dampening material (29; 129; 229; 329; 429) sandwiched between said adjustment block (15; 115; 215; 315; 415) and said joist attachment device (13; 113; 213; 313; 413), characterized in that said at least one first engagement means (27; 127; 227; 327; 427) comprises a hook and said at least one second engagement means (28; 128; 228; 328; 428) comprises an abutment such that said hook is snap-fitted with said abutment, or that said at least one first engagement means (27; 127; 227; 327; 427) comprises an abutment and said at least one second engagement means (28; 128; 228; 328; 428) comprises a hook such that said hook can be snap-fitted with said abutment. a level adjustment device (12; 112; 212; 312; 412), a joist attachment device (13; 113; 213; 313; 413), said level adjustment device (12; 112; 212; 312; 412) comprises, a level adjustment screw, an adjustment block (15; 115; 215; 315; 415), said level adjustment screw comprises a first part intended to contact an underlying surface and a second part adapted to engage with said adjustment block (15; 115; 215; 315; 415), further said joist attachment device (13; 113; 213; 313; 413) comprises at least one first engagement means (27; 127; 227; 327; 427) and said adjustment block (15; 115; 215; 315; 415) comprises at least one second engagement means (28; 128; 228; 328; 428), which first and second engagement means (27, 28; 127, 128; 227, 228; 327, 328; 427, 428) are complementary with each other and are adapted to engage with each other in an assembled state, further said joist attachment device (13; 113, 213; 313; 413) comprises an engagement part (22; 122; 222; 322; 422) adapted to be attached to a floor joist, and said floor support device (1;101; 201; 301; 401) further comprises a dampening material (29; 129; 229; 329; 429) sandwiched between said adjustment block (15; 115; 215; 315; 415) and said joist attachment device (13; 113; 213; 313; 413), characterized in that said at least one first engagement means (27; 127; 227; 327; 427) comprises a hook and said at least one second engagement means (28; 128; 228; 328; 428) comprises an abutment such that said hook is snap-fitted with said abutment, or that said at least one first engagement means (27; 127; 227; 327; 427) comprises an abutment and said at least one second engagement means (28; 128; 228; 328; 428) comprises a hook such that said hook can be snap-fitted with said abutment.