He was elected to the Norwegian Parliament from Nord-Trøndelag in 2005. He had previously served in the position of deputy representative during the terms 1997–2001 and 2001–2005. Eriksson held various positions in Verdal municipality council from 1991 to 2005. From 1995 to 2005 he was also a member of Nord-Trøndelag county council.
Robert Eriksson was born 23 April in Levanger in Nord-Trøndelag county. His parents are truck-driver Gjermund Eriksson (1955-) and mother Rita Helene Musum (1956-) who worked as an office manager. He attended elementary school at Ness elementary school between 1981-1987, and Verdalsøra lower secondary school between 1987-1990.
Later he enrolled at the Verdal Upper Secondary school between 1990 and 1993. After finishing secondary school, he was drafted into the Norwegian army serving his mandatory service from 1993 to 1994. He later studied corporate economy at the Nord-Trøndelag University College.