The determination of odor recognition threshold values of n- and iso-amyl (pentyl) acetates was carried out by odor panel test (Japanese students 18-22 years old;6 males and a female) using 10- liter Tedlar bag static method. The trace concentrations of n-and iso-amyl acetates in the Tedlar bag were determined by gas chromatography and an odor sensor (SnO₂ type). The odor recognition threshold values of amyl acetates were 7.70ppm for n-amyl and 1.50ppm for iso- amyl. The odor quality from several odor panels were evaluated, such as a binder solvent-like, aqueous paint, stimuli, fruity, aromatic, ether-like, gasoline-like, pungent, minty, sour, petroleum- like, respectively.