  We prove in this paper a classicality result for overconvergent modular forms
on PEL Shimura varieties of type (A) or (C), without any ramification
hypothesis. We use an analytic continuation method, which generalizes previous
results in the unramified setting. We work with the rational model of the
Shimura variety, and use an embedding into the Siegel variety to define the
integral structures on the rigid space.
