A battery holder (100) includes an insulative housing (1), a positive contact (3) and a negative contact (2). The housing defines a bottom wall (10) and a sidewall (11) extending from the bottom wall, which form a receiving room (12). The housing further defines a spring wall (14). The spring wall can elastically deform for positioning a battery or releasing a battery. A protecting wall (17) is defined around the spring wall, and a predetermined distance is formed between the protecting wall and the spring wall. While the spring wall is forced to deform, the protecting wall can stop the deforming process of the spring wall and thus can protect the spring wall from breakage.