When the sensor block 10 is placed on the roller block 20 and the reading surface of the reading sensor 31 faces the aforementioned driving roller 28, then paper is automatically fed with the driving roller 28 and text and image data are read with the reading sensor 31. On the other hand, when the sensor block 10 is reversed 180.degree. and placed again over the roller block 20, then the reading sensor 31 reads text and images when the sensor block 10, arranged beneath the roller block 20, are moving or the document by manual operation.