A smear slide preparing apparatus comprising: a smear section for smearing a sample on a slide glass, a slide storing section for storing a plurality of slide glasses on each of which a sample is to be smeared by the smear section; a sample-related information providing section for providing sample-related information which is related to the sample on the slide glass and a slide transporting part (12, 13) for transporting a slide glass from the slide storing section to the sample-related information providing section; the sample - related information providing section comprises a thermal transfer printer for printing the sample-related information on the slide glass; wherein the slide glass comprises a smear region on which the sample is to be smeared and a non-smear region having the sample-related information area; characterised in that: the smear slide preparing apparatus comprises an attached matter removing section for removing attached matter which is attached to a sample-related information area of the slide glass; the attached matter removing section comprising a removal air blowing part for blowing removal air to the sample-related information area to remove the attached matter; the attached matter removing section further comprises an air pressure source configured to supply air to the removal air blowing part; the smear slide preparing apparatus further comprises predetermined parts other than the attached matter removing section configured to receive air from the air pressure source; the attached matter removing section further comprises a flow switching part connected to the air pressure source, to the removal air blowing part, and to said predetermined parts other than the attached matter removing section, the flow switching part being configured to switch the flow path of the air to supply the air pressure supplied from the air pressure source to the predetermined parts other than the attached matter removing section or to the removal air blowing part, and in that: the smear slide preparing apparatus further comprises a controller for controlling the attached matter removing section and the sample-related information providing section so as to provide the sample-related information on the sample-related information area after removing the attached matter. a smear section for smearing a sample on a slide glass, a slide storing section for storing a plurality of slide glasses on each of which a sample is to be smeared by the smear section; a sample-related information providing section for providing sample-related information which is related to the sample on the slide glass and a slide transporting part (12, 13) for transporting a slide glass from the slide storing section to the sample-related information providing section; the sample - related information providing section comprises a thermal transfer printer for printing the sample-related information on the slide glass; wherein the slide glass comprises a smear region on which the sample is to be smeared and a non-smear region having the sample-related information area; characterised in that: the smear slide preparing apparatus comprises an attached matter removing section for removing attached matter which is attached to a sample-related information area of the slide glass; the attached matter removing section comprising a removal air blowing part for blowing removal air to the sample-related information area to remove the attached matter; the attached matter removing section further comprises an air pressure source configured to supply air to the removal air blowing part; the smear slide preparing apparatus further comprises predetermined parts other than the attached matter removing section configured to receive air from the air pressure source; the attached matter removing section further comprises a flow switching part connected to the air pressure source, to the removal air blowing part, and to said predetermined parts other than the attached matter removing section, the flow switching part being configured to switch the flow path of the air to supply the air pressure supplied from the air pressure source to the predetermined parts other than the attached matter removing section or to the removal air blowing part, and in that: the smear slide preparing apparatus further comprises a controller for controlling the attached matter removing section and the sample-related information providing section so as to provide the sample-related information on the sample-related information area after removing the attached matter.