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Pulmonary aspiration (mis-swallowing) causes more than 90% of pneumonia in elderly people. Ingested food unconsciously remaining in the piriform sinus occasionally Hows into the trachea leading to aspiration. If food remaining in the piriform sinus is noninvasively detected from outside the body, the risk of pulmonary aspiration can be evaluated We propose a method using near-infrared fluorescence emitted from fluorescence food, and this study reports the results of preliminary experiments using meat phantoms. The results showed that fluorescence from the fluorescence food embedded in thick meat was detectable and indicated that the method could be potentially applicable for evaluating the risk of pulmonary aspiration.