Studying in Canada: Work permits for students―Working on campus
You may work on campus at the institution where you study without a work permit if:
* you are a full-time student at:
o a public post-secondary institution, such as a college or university, or a collège d’enseignement général et professionnel (CEGEP) in Quebec
o a private post-secondary institution that operates under the same rules and regulations as a public institution, and receives at least 50 percent of its financing for its overall operations from government grants (currently only private college-level educational institutions in Quebec qualify) or
o a Canadian private institution authorized by provincial statute to confer degrees and
* you have a valid study permit.
http://www.cic.gc.ca/english/study/work-oncampus.asp
トピ主さんはフルタイムの学生ですか?