Automatic processing device of culture plates for microbiological samples, wherein the processing device comprises at least: a support frame; a slide or shuttle provided with a seating configured for removably housing, in a horizontal position, at least a culture plate for microbiological samples, the slide being movably mounted on the support frame so as to be selectively displaceable at least between a first loading position of the culture plate on the slide, a plurality of image-acquiring positions, and at least a first unloading position of the culture plate from the slide; a camera arranged according to a vertical axis such as to acquire, at an image-acquiring zone, a multiplicity of images of an upper surface of the culture plate housed on the slide; at least a first lighting device mounted on the support frame such as to illuminate at least linear portions of an upper surface of the culture plate, at least at the image-acquiring zone; an advancing device of the slide; and at least an electronic control device of a functioning of the camera, of the lighting device and of the advancing device; the processing device being characterized in that: - the camera is of a linear type and is provided with at least an optic of a telecentric type and a trilinear sensor, and is arranged such as to acquire, at an image-acquiring zone, a multiplicity of linear images of corresponding linear portions of the upper surface of the culture plate housed on the slide, during the displacing of the slide, each linear image being acquired at a relative position of the image-acquiring position, the linear images being assemblable such as to obtain overall images at least of the culture plate; and in that - the advancing device of the slide is configured such as to enable obtaining a constant and substantially vibration-less advancing speed of the slide at least in the image-acquiring zone. a support frame; a slide or shuttle provided with a seating configured for removably housing, in a horizontal position, at least a culture plate for microbiological samples, the slide being movably mounted on the support frame so as to be selectively displaceable at least between a first loading position of the culture plate on the slide, a plurality of image-acquiring positions, and at least a first unloading position of the culture plate from the slide; a camera arranged according to a vertical axis such as to acquire, at an image-acquiring zone, a multiplicity of images of an upper surface of the culture plate housed on the slide; at least a first lighting device mounted on the support frame such as to illuminate at least linear portions of an upper surface of the culture plate, at least at the image-acquiring zone; an advancing device of the slide; and at least an electronic control device of a functioning of the camera, of the lighting device and of the advancing device; the processing device being characterized in that: - the camera is of a linear type and is provided with at least an optic of a telecentric type and a trilinear sensor, and is arranged such as to acquire, at an image-acquiring zone, a multiplicity of linear images of corresponding linear portions of the upper surface of the culture plate housed on the slide, during the displacing of the slide, each linear image being acquired at a relative position of the image-acquiring position, the linear images being assemblable such as to obtain overall images at least of the culture plate; and in that - the advancing device of the slide is configured such as to enable obtaining a constant and substantially vibration-less advancing speed of the slide at least in the image-acquiring zone. - the camera is of a linear type and is provided with at least an optic of a telecentric type and a trilinear sensor, and is arranged such as to acquire, at an image-acquiring zone, a multiplicity of linear images of corresponding linear portions of the upper surface of the culture plate housed on the slide, during the displacing of the slide, each linear image being acquired at a relative position of the image-acquiring position, the linear images being assemblable such as to obtain overall images at least of the culture plate; and in that - the advancing device of the slide is configured such as to enable obtaining a constant and substantially vibration-less advancing speed of the slide at least in the image-acquiring zone.