Abstract: In a clock-studying picture book, a picture book body illustrating respective picture patterns relating to various times of day is provided with a sound generator which, when a long hand or short hand, or both the long and short hands are controlled to point to a specific time, generates a sound making the specific time recognizable, so that the infant can study the clock and time while enjoying himself during play.

Abstract: A picture book including a switch unit mounted on part of the book. The switch unit is arranged in the style of an immitated telephone dial and is provided with a plurality of switching means. The picture book also provides a sound generator having a unit for generating false musical instrumental sound corresponding to activated switching means.The picture book is further provided with at least one of two kinds of leaves, the one containing a picture to allow the switch unit to be part of a telephone and the other one containing a picture which makes up part of musical instrument.