  We investigate the norm maps of algebraic even $K$-groups of finite
extensions of number fields. Namely, we show that they are surjective in most
situations. In the event that they are not surjective, we give a criterion in
determining when an element in the even $K$-group of the base field comes from
a norm of an element from the even $K$-groups of the extension field. This
latter criterion is only reliant on the real primes of the base field.
