The purpose of this study was to investigate the impact on their caregiver of urinary incontinence in frail elderly persons cared for at home. The study also aimed to explore the relationships between the characteristics of the elderly and their caregivers, and the degree of burden experienced by the caregivers. Questionnaires were distributed to 162 caregivers. The questionnaire consisted of demographic questions, the Japanese version of the Zarit Burden Inventory (J-ZBI), and a voiding check sheet used to identify the types of urinary incontinence. Of 162 caregivers, 101 returned completed questionnaires (a 62.3% response rate). The results showed that 94 out of 101 elderly persons (93.1 %) had urinary incontinence. The degree of care burden experienced by caregivers was higher when they had to care for elderly with urinary incontinence than those without it. Moreover, the J-ZBI scores of the caregivers were moderately higher when the elderly required a moderate degree of voiding assistance than when they required no assistance (p < 0.1). Similarly, the J-ZBI scores were moderately higher when the caregivers had to care for elderly who used incontinence pads, compared with those who did not use them (p < 0.1). On the other hand, the J-ZBI scores of caregivers who received support from others were significantly lower compared with those without support (p < 0.05). It is important to improve the toileting ability of elderly persons who need incontinence pads and/ or a moderate level of voiding assistance by providing adequate rehabilitation training. Such training includes exercise in transferring to a toilet, exercise in pulling underwear up and down and exercise in wearing incontinence pads.