Abstract N-type voltage-gated calcium (Ca V ) channels mediate Ca 2+ influx at the presynaptic terminals in response to action potential and play vital roles in synaptogenesis, neurotransmitter releasing, and nociceptive transmission. Here we elucidate a cryo-electron microscopy (cryo-EM) structure of the human Ca V 2.2 complex at resolution of 2.8 Å. This complex structure reveals how the Ca V 2.2, β1, and α2δ1 subunits are assembled. In our structure, the second voltage-sensing domain (VSD) is stabilized at a resting-state conformation, which is distinct from the other three VSDs of Ca V 2.2 as well as activated VSDs observed in previous structures of Ca V channels. The structure also shows that the intracellular gate formed by S6 helices is closed, and a W-helix from the DII-III linker is determined to act as a blocking-ball that causes closed-state inactivation in Ca V 2.2. Collectively, our structure provides previously unseen structural insights into fundamental gating mechanisms of Ca V channels.