The relation between the process of social support and the receiver's trust in a support provider was examined in a longitudinal design. Support receivers were 270-freshmen at university. Support providers were their parents, a new and an old friend. Analysing questionnaires indicates the following: (1) When person was subjected to high stress level, the received support improved the receivers' trust in the providers independent of the source of support. (2) For medium stress level, disparities between the receivers' support expectation and the actual receipt modified their trust in fathers and new friends. (3) The prospective receipt of support was related not only to the previous receipt support and norm on support provision but also the receivers' trust in the providers.