An electronic device assembly includes a protective apparatus, a first electronic member, and a pivotal mechanism. The protective apparatus includes an upper housing and a lower housing. The first electronic member is housing in the upper housing. The pivotal mechanism received in the lower housing rotates the upper housing relative to the lower housing. When the upper housing is unlatched by the pivotal mechanism from the lower housing, the first electronic member leaves the protective apparatus, and when the upper housing is driven by the pivotal mechanism to latch to the lower housing, the first electronic member is shielded in the protective apparatus.