The elderly people are characterized by multiple comorbidities, dementia, and are at risk of developing sarcopenia and frailty. Sarcopenia is defined by loss of muscle mass and muscle strength or physical decline. Sarcopenia is a main component of physical frailty. Screening tools for sarcopenia that can be easily determined in daily practice are useful and include the SARC-F screening tool. SARC-F is a questionnaire consisting of five questions: Strength (S), Assistance walking (A), Rising from a chair (R), Climbing stairs (C), and Falls (F) on a scale of 0 to 2. The recommended cutoff value is ≥4 points. The SARC-F has been shown to correlate well with clinical outcomes in the elderly and various underlying diseases, while it is also true that the SARC-F has its shortcomings such as low sensitivity for sarcopenia. In this review, we mainly outline the SARC-F and mention other screening tools for sarcopenia.The aging of Japan's population continues to accelerate (1). According to the Japanese government report, the aging rate (65 years old or older) was 15.1% of the total population in 1996, but it increased significantly to 28.4% in 2019 (2). In addition, the estimated aging rate as of January 1997 is projected to be 27.4% in 2025, but as of 2019, it has already exceeded the projection. The number of people aged 65 or older will continue to increase, and is estimated to reach 33.3% in 2036 and 38.4% in 2065. In order to improve the quality of life (QOL) of the increasing number of elderly people, efforts have been made in the fields of health, medical care, and welfare to extend healthy life expectancy (the period of time during which there are no limitations in daily life), but there are still many issues to be addressed. The elderly people are characterized by multiple comorbidities, dementia, and risk of sarcopenia and frailty (3). In 2019, the Ministry of Health, Labour and Welfare (MHLW) in Japan published the "Guidelines for Health Services Based on the Characteristics of the Elderly, Version 2", and announced the strengthening of measures against frailty, especially for elderly people aged 75 or older. The guidelines newly added the implementation of "health checkups for frailty" with the aim of integrating health guidance and care prevention. Specifically, the report has recommended the use of a "questionnaire for the elderly aged 75 or older" focusing on frailty in health checkups and other examinations conducted by municipalities since fiscal 2020. This questionnaire is expected to help prevent and raise awareness of frailty among many elderly people. Early intervention through such efforts will lead to a prolongation in healthy life expectancy. In addition, sarcopenia is a condition that forms the basis of physical frailty (4). Sarcopenia leads to decreased physical activity, and decreased physical activity leads to sarcopenia. Both are involved in frailty, forming the so-called "frailty cycle" (4). On the other hand, the number of people aged 60 or older in the world was estimated to be 600 million ...