This essay is about children's rooms and playrooms at museums. It is a study comparing and examining the envi-ronments of three museums. The museums and play-environments that have been examined are Sjöhistoriska museet with the playroom Blubb, Historiska museet with the playroom Arkeoteket and Upplandsmuseet with the playroom Lilla Kvarn. The selected museums are all located in larger citiesand have free admission. All muse-ums are historically oriented.The main methodsused in the thesis is observation and interviews. Interviewstook place with relevant mu-seum staff who were linked to the design and execution of the playroom. Observations were made on two occa-sions, one before and one after the interview. This was so information granted in the interview could be integrat-ed in thelater observation. Actor-network theory or ANT is the theoretical foundation in the work together with similar theoretical reasoning as knowledge theory. Literature relevant to the topic has also been used as discussion material.The purpose of the essay has been to highlight the importance of playroom at the museum. The questions under investigation were: Is playroom at museums part of the exhibition? To answer this,additional questions were added: What is the purpose of the room/ space? Who is the target audience? How is the space designed and on what grounds? Does the room have educational purposes? How does the room work in practice? The results of observation and interview have shown that playrooms are a way for museums to reachthe younger  visitors. Young visitors are often neglected in exhibitions. The playroom offers a break from the remaining exhibitions with the opportunity to play, learn but also rest.The examined museums have several similar themes as they approach in different ways. For example, a reading corner with place to rest. The overall theme has also been "escape from reality" where the playroom's themes have been underwater, underground and "the past". This is a two years master ́s thesis in Museum and Cultural Heritage Studies.