Document and Entity Information	0 Months Ended
	May 31, 2013
Risk/Return:
Document Type	497
Document Period End Date	May 31, 2013
Registrant Name	MORGAN STANLEY VARIABLE INVESTMENT SERIES
Central Index Key	0000716716
Amendment Flag	false
Document Creation Date	May 31, 2013
Document Effective Date	May 31, 2013
Prospectus Date	Apr. 30, 2013