This study attempted to typify the shoulder and arm morphology of adult males by analyzing the shoulder and arm-related items by obesity level for adult males aged 20 to 69 years. I also examined the typified shoulder and arm characteristics and attempted to analyze the types by obesity level for each age group. The shoulders and arms of adult males were categorized into four types: broad, drooping shoulders with thin, long arms; narrow, drooping shoulders with thick, long arms; broad, rising shoulders with short, thick arms; and narrow, rising shoulders with short, thin arms. The underweight group had a higher percentage of Type 1 in their 20s, 30s, and 60s, and a higher percentage of Type 4 in their 40s. The normal weight group was analyzed as having a higher percentage of type 1 in their 20s and 30s, and a higher percentage of type 4 in their 40s, 50s, and 60s. Obese group was analyzed as having a higher percentage of type 3 in their 20s, 30s, 40s, and a higher percentage of type 4 in their 50s and 60s.