In addition to palliative care delivery at home or in hospital, palliative day care centres occupy an in-between position in palliative care. In palliative day care centres, multidisciplinary teams provide holistic care and support for people with (chronic) life-limiting conditions, or clients, in a homely surrounding, allowing them to remain living at home while attending a specialist palliative care service. This study aims to evaluate palliative day care centres from a user perspective. We conducted a full-population cross-sectional survey of clients (N = 86) and their family caregivers (N = 63) in all five palliative day care centres in Flanders, Belgium from January until December 2019. We used validated instruments supplemented with self-developed items to measure participants' reasons for use, support provided, unmet support needs and added value to other (palliative) care services across palliative care domains, i.e., physical, psychological, social and spiritual care. Response rate was 77% for clients and 81% for family caregivers. The most often indicated reasons for use were that the client needs social contacts (clients: 73%, caregivers: 65%), to enable the client to live at home as long as possible (resp. 58%, 55%) and to reduce the family caregiver's mental burden (resp. 42%, 65%). Three out of four family caregivers felt better able to combine daily activities with caring for the client (77%) and felt better able to perform their family care-giving tasks (77%) because the client attends the palliative day care centre. Thirty-six per cent of clients had received support for social needs exclusively in the palliative day care centre and not from any professionals outside palliative day care. Palliative day care centres seem to be of added value for those care domains to which often less attention is paid in other settings, particularly social and emotional support, both for clients and family caregivers.