Progress and a price reduction of the photovoltaic power generation technology are important research themes. Then, it is splendid if the poisonous plant and the activated carbon can be used. A poisonous plant and the used activated carbons are collected in large quantities and cheaply from the imminent place. With the I-V characteristics of dye-sensitized solar cell where four kinds of edible food colors for as an adsorption pigment each were used, the open circuit voltage, short circuit photocurrent density, and light energy conversion efficiency were showed the highest values for a gardenia blue pigment. With the CV curves of the glassy carbon electrode before and after the modification of the ingredient derived from charcoal burner, a cathodic peak potential around -755 mV was positively shifted to the approximately 125 mV after modification.