This study aimed to identify consumer demands and propose improvement measures for restaurants by conducting an importance-satisfaction analysis of the attributes that influence dining consumers’ restaurant selection. The key findings are as follows: An analysis of consumer hygiene behavior revealed that participants were particularly vigilant about washing food ingredients, checking expiration dates, and maintaining personal hygiene before meals. Notably, women exhibited significantly higher hygiene behaviors than men in 9 out of 12 items. The importance analysis of restaurant selection attributes indicated that “food cleanliness” and “food taste” were prioritized, with women assigning higher importance to almost all attributes, particularly emphasizing restaurant cleanliness and food taste. The satisfaction analysis showed that “food taste” and “food cleanliness” were the most satisfying attributes, with significant gender differences observed in 4 out of 26 items. The importance-satisfaction analysis demonstrated that satisfaction levels were consistently lower than importance levels across all 26 attributes. The ISA analysis identified that items in the second quadrant, such as restroom cleanliness, reasonable price, and the provision of food safety information, were in the most urgent need of improvement. Overall, the study highlights that consumers place a high level of importance on hygiene and cleanliness in restaurants, reflecting a market with increasingly stringent hygiene standards.