PROBLEM TO BE SOLVED: To provide a sleep state evaluation device or the like that objectively detects a sleep state of a sleeping person (measured person) by a simple method and evaluates the sleep quality of the measured person from the sleep state. SOLUTION: At least as a state of a person to be measured, a sleep state storage means for storing a sleep state indicating any one of three states of getting out of bed, sleep and awakening, and based on the stored sleep state, Bed time, calculating means for calculating the sleeping time during the day, based on the bed time during the day, and the sleeping time during the day, an evaluation means for evaluating the quality of sleep of the subject. It is characterized by including. [Selection diagram] Figure 4【課題】簡易な方法で、就寝者（被測定者）の睡眠状態を客観的に検出し、睡眠状態から被測定者の睡眠の質を評価する睡眠状態評価装置等を提供すること。【解決手段】少なくとも被測定者の状態として、離床、睡眠及び覚醒の３状態の何れか１つを示す睡眠状態を保存する睡眠状態保存手段と、保存された睡眠状態に基づいて、日中の在床時間と、日中の睡眠時間とを算出する算出手段と、日中の在床時間と、日中の睡眠時間とに基づいて、前記被測定者の睡眠の質を評価する評価手段とを備えることを特徴とする。【選択図】図４
