A mobile body that acquires product information given to a product to be purchased and transports the product to be purchased, the mobile body comprising: a cart body that is moved to transport the product; an acquisition device that acquires the product information; and a holder that detachably holds the acquisition device, the acquisition device including a head that includes an information acquisition unit provided on a forward side of a front-rear direction, the information acquisition unit being to be directed to the product to acquire the product information, the head having a first predetermined width in a right-left direction orthogonal to the front-rear direction, the first predetermined width on a rearward side of the front-rear direction being narrower than the first predetermined width on the forward side, and a handle provided on a lower part on the rearward side of the head, the handle having a second predetermined width in the right-left direction, the second predetermined width being narrower than the first predetermined width on the rearward side of the head, the holder being attached to the cart body, the holder including a pair of head regulators provided to have a space that is narrower than a maximum width of the first predetermined width of the head and wider than a maximum width of the second predetermined width of the handle, the pair of head regulators being adapted to be in contact with a side surface on the rearward side of the head held in the space, a head support that is adapted to be in contact with a lower surface of the head held in the space of the pair of head regulators, and a stopper that is adapted to be in contact with a surface on the forward side of the front-rear direction of the handle while the head is held in the space of the pair of head regulators. a cart body that is moved to transport the product; an acquisition device that acquires the product information; and a holder that detachably holds the acquisition device, the acquisition device including a head that includes an information acquisition unit provided on a forward side of a front-rear direction, the information acquisition unit being to be directed to the product to acquire the product information, the head having a first predetermined width in a right-left direction orthogonal to the front-rear direction, the first predetermined width on a rearward side of the front-rear direction being narrower than the first predetermined width on the forward side, and a handle provided on a lower part on the rearward side of the head, the handle having a second predetermined width in the right-left direction, the second predetermined width being narrower than the first predetermined width on the rearward side of the head, a head that includes an information acquisition unit provided on a forward side of a front-rear direction, the information acquisition unit being to be directed to the product to acquire the product information, the head having a first predetermined width in a right-left direction orthogonal to the front-rear direction, the first predetermined width on a rearward side of the front-rear direction being narrower than the first predetermined width on the forward side, and a handle provided on a lower part on the rearward side of the head, the handle having a second predetermined width in the right-left direction, the second predetermined width being narrower than the first predetermined width on the rearward side of the head, the holder being attached to the cart body, the holder including a pair of head regulators provided to have a space that is narrower than a maximum width of the first predetermined width of the head and wider than a maximum width of the second predetermined width of the handle, the pair of head regulators being adapted to be in contact with a side surface on the rearward side of the head held in the space, a head support that is adapted to be in contact with a lower surface of the head held in the space of the pair of head regulators, and a stopper that is adapted to be in contact with a surface on the forward side of the front-rear direction of the handle while the head is held in the space of the pair of head regulators. a pair of head regulators provided to have a space that is narrower than a maximum width of the first predetermined width of the head and wider than a maximum width of the second predetermined width of the handle, the pair of head regulators being adapted to be in contact with a side surface on the rearward side of the head held in the space, a head support that is adapted to be in contact with a lower surface of the head held in the space of the pair of head regulators, and a stopper that is adapted to be in contact with a surface on the forward side of the front-rear direction of the handle while the head is held in the space of the pair of head regulators.