Yes, I agree with Nestor and kok328, two jack studs and a doubled up header will do the trick, that span is very short.
Let's hear from you and show us your shelf unit. Sounds like a great storage idea there ilyaz.
Budro is right, YOU can do it!
Wife: "You can buy anything you want when you redo this house."
Husband: "Could I get that in writing, dear?"