Until recently most corpus studies that have focused on learner language have been biased towards Indo-European languages, especially English. This situation is, however, changing gradually. This presentation focuses on learner corpora of Finnish language and provides examples of studies that have been conducted using those learner data. The current learner data can be divided into five second language data and one foreign language data. Examples are given, for example, how these data provide information on phraseology in learner writing, how learners cope with certain grammatical forms and develop during learning and how the learning context (FFL or FSL) affects the learner production.