The Spanish civil war ended in 1939, however the dictatorial regime of General Franco survived until his death in 1975. The transition toward democracy did not mean a clear break with the dictatorial regime. The communists and the socialists agreed to amnesty for crimes of Franco’s regime and to focus on a common future by the process of cultural forgetting. However, since the turn of the millennium the generation of grandchildren has been engaged in recuperating the memory repressed of the civil war and the post war repression of dictatorial regime. Antonio Muñoz Molina gives voice to victims with the acts of writing considered as affiliative postmemory engagement. The aim of this article is to examine the aspects of transmission of trauma across generations and the representation of trauma in the postmemorial generation in the novel El jinete polaco(1991). We argue that how the postmemory is distinguished from history by a deep personal connection and from memory by a generational distance. Especially, it is focused that the postmemory is a form of intimate familarity with the past of ancestors mediated through recollections but through an imaginative investment. With a media of memory such as pictures, songs and photographs, the postmemorial generation creates the intergenerational relationship to distant past and reconstructs the past of ancestors. In this analysis, it is demonstrated that this novel becomes an intersubjective transgenerational space of remembrance.