The main purpose of this essay was to study whether niche parties that were represented in municipal councils in Sweden during the 2007-2010 term of office were politically relevant. Furthermore, factors that might facilitate political relevance for niche parties were studied. Political relevance was studied using two theoretical perspectives. The objective model of political relevance presents four categories of relevance based on the relations between political parties in a political assembly; governing parties, coalition parties, blackmail parties and isolated parties. The subjective model of political relevance relies on the party representatives’ own judgments of the relevance of their parties. To study objective and subjective political relevance, party representatives were interviewed. The results showed that seven out of eight niche parties were politically relevant according to the objective model, and six out of eight niche parties were relevant according to the subjective model. For the study of possible facilitating factors, a comparative table was formed using statistics and official data. Percentage of seats and type of majority coalition seemed to affect the possibilities for niche parties to become governing parties. A large percentage of seats and being represented on the municipal executive board and committees seemed to facilitate subjective political relevance.