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Floor impact noises in apartment buildings have been investigated as they are most annoying among the noises in living environment. Several experiments were undertaken to compare perceived noisiness of floor impact noises generated by bang and tapping machine along with children's jumping and running. Results show that bang noise is louder and noisier than tapping noise by 5-7dB. It seems that the floor impact noise generated by children's jumping and running corresponds well with the bang-machine noise. The noise generated by children is somewhat different from machine noise; in spatial impression the real noise is similar to tapping-machine noise but is less annoying that the machine noises. It is also found that the effects of overall noise level, decaying time, octave band level differences and spatial impression were significant in perceived noisiness of the impact noises.