An object of the invention is to provide an arrangement structure of an electrical connection box, an electrical connection box, a wire harness, and a vehicle in which proper assembly workability canbe secured in parts around the electrical connection box. An arrangement structure (100) of an electrical connection box (1) applied to a wire harness (WH) includes a mounting portion (102) on which an object (101) is mounted; and an electrical connection box (1), including: an accommodating space portion in which an electronic component (2) is accommodated; and a guide surface (38) disposed at acorner portion of an upper side in the vertical direction of the outer surface and capable of guiding and moving the object (101) laterally in the horizontal direction while from the upper side to thelower side in the vertical direction, wherein the electrical connection box (1) is disposed at a position adjacent to the mounting portion (102) such that the guide surface (38) faces the mounting portion (102) side with respect to the horizontal direction.
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