a handheld scanner including a head incorporating a reading sensor and a handle which is a gripping part having one end portion connected to the head, and configured to read a code symbol image by the reading sensor;

an adjuster attached to the head and surrounding a readable angular area of the reading sensor; and

a pedestal to which the adjuster is detachably coupled, and configured to hold the adjuster in such a direction that the readable angular area of the reading sensor is substantially equal in an up-down direction with respect to a horizontal direction,

wherein the adjuster has a tubular shape,

wherein an edge portion of the adjuster farther from the reading sensor and the pedestal form a coupling structure for detachably coupling each other, and

wherein the pedestal includes a first flat plate portion having an opening corresponding to a reading area of the handheld scanner and coupled to one of edges of the adjuster at a position surrounding the opening, and a second flat plate portion substantially orthogonal to the first flat plate portion.